Lake MXZ 303 Winter Boots

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Item # LKC000A

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Item # LKC000A

Put Old Man Winter in his place.

Not only has Lake been building cycling shoes for what seems like forever, the iconic brand pretty much pioneered the concept of winter riding boots. So, when we heard that Lake was back at it with the MXZ 303 Winter Boots, needless to say we were excited. While the previous iteration, the MXZ 302, was praised for its warmth, there were a handful of features that held it back from reaching its full potential. Thankfully, with the 303, those irksome details have been weeded out, and what you're left with is a warm, versatile, high top, off-road riding boot that comes into its element once your shoe covers are no longer cutting the mustard.

As always, correctly chosen materials are essential for keeping your feet warm when the temps drop below freezing, and there's nothing to worry about with the MXZ 303. The upper is Pittards full-grain leather, which is not only incredibly durable, but it will break in for a perfect fit as well. The outsole is a Vibram offering, with a high-grip rubber compound for walking through snow drifts. Lake also employs Outlast heat reflective technology in the heel and tongue liner. The Outlast inserts retain heat from your feet, releasing it back into the boot when the temperature drops. In other words, they'll keep you warmer for longer. Granted, it shouldn't be an issue, thanks to the 3M Thinsulate insert in the toe box, which blocks wind and keeps your digits warm. And as if this all weren't enough, the insole takes advantage of Thermosol composite insulation. In case it wasn't obvious, these are built to handle everyday winter riding for everything short of an Arctic expedition.

Getting snow in your shoes can quickly get the better of even the warmest boots, but with an over-ankle neoprene cuff, that won't be a concern. There's a leather flap where you'd typically find laces, which serves to block out wind and moisture. It's held tight by a BOA ratchet, which enables easy fine tuning of your fit, without the risk of coming loose mid ride. And a buckle holds the ankle flap in place, yet again adding protection. As you'd expect, it's compatible with standard two-hole mountain cleats. If you refuse to hang up the bike just because there's a little snow on the ground, this could very well be the answer you've been looking for.

The Lake MXZ 303 Winter Boots are available in whole and half sizes from 38 to 50, with a wide option available in whole sizes from 38 to 48. The boots come in the colors Black/yellow and Black/silver.

  • Winter cycling shoe
  • Two-hole cleat compatibility
  • Reflective, heat-conserving insert
  • Vibram sole
  • Pittards upper
  • Neoprene cuff

Tech Specs

Upper Material:
Pittards leather
Closure:
BOA
Footbed:
Thermosol composite insulated
Midsole:
fiberglass-injected high-impact nylon
Sole:
Vibram Mountain V
Cleat Compatibility:
2-hole MTB
Recommended Use:
cycling

Size chart

Cycling Shoes

Men's
US SHOE SIZE5.566.577.588.599.51010.51111.51212.51313.514
Chrome 37.5 38 39 39.5 40 41 41.5 42 43 44 44.5 45 46 47   47.5   48
Diadora 38 39 39.5 40 40.5 41 42 42.5 43 43.5 44 44.5 45 45.5 46     
DMT 38   39   40 41 42 42.5 43 43.5 44.5 45 45.5 46   47 48  
Five Ten 37 38 38.5 39 40 40.5 41 42 42.5 43 44 44.5 45 46 46.5 47   
Fi'zi:k 38 39 39.5 40 40.5 41 42 42.5 43 43.5 44 44.5 45 45.5 46     
Gaerne 38 39   40   41 42 42.5 43 44 44.5 45   46 47 48   
Giro   39 40 40.5 41 42 42.5 43 43.5 44.5 45 45.5 46 46.5 47 48  
Lake 39.5 40 40.5 41 41.5 42 42.5 43 43.5 44 44.5 45 45.5 46 46.5 47 48  
Louis Garneau 38.5 39 39.5 40 40.5 41 41.5 42 43 44 44.5/45 45.5 46 47 48 49 50
Mavic (US/EU) 5.5 / 38 6 / 38.7 6.5 / 39.3 7 / 40 7.5 / 40.7 8 / 41.3 8.5 / 42 9 / 42.7 9.5 / 43.3 10 / 44 10.5/ 44.7 11 / 45.3 11.5 / 46 12 / 46.7 12.5 / 47.3 13 / 48 13.5 / 48.7  
Northwave 37   38 39 40 40.5 41 41.5 42 42.5 43 44 44.5 45 45.5 46 47 48
Pearl Izumi 38 39 39.5 40 41 41.5 42 42.5 43 44 44.5 45 46 46.5 47 48 48.5 49
Shimano 38.5 39.5 40 40.5 41 41.5 42 43 44 44.5 45 45.5 46.5 47   49   50
Sidi  39 40 40.5 41 41.5 42 / 42.5 43 43.5 44 / 44.5 45 45.5 46 / 46.5 47 47.5 48 48.5 49
Six Six One 38 38.5 39 40 40.5 41 42 43 43.5 44 44.5 45   46 47 48 49 50
Suplest 37 38   39 40 41   42 42.5 43 43.5 44 44.5 45   46   47
Vans 37 38 38.5 39 40 40.5 41 42 42.5 43 44 44.5 45 46   47   48
US SHOE SIZE5.566.577.588.599.51010.51111.51212.51313.514

Reviews & Community

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Warm, good function on and off bike.

  • Familiarity: I've put it through the wringer

Went all in on snowbiking this past winter and added these to my kit. I tried on virtually all the available boots comparable and the wide version of these fit the best. I've used them with the 'old' (pre 2016) egg beaters and also with the new Crank Bros Double Shot pedal. I have used the metal cleat shim (per shoe instructions) and have had no problem with clipping in/out and I have not had to carve any of the sole away as sometimes needed. I've got some wading boots (fly fishing) with the boa closure and have had some instances where the BOA ratchet freezes up after dunking in a river and then coming out to freezing temps (forcing you to thaw things in the truck to get your boots off). I've never had the same issue on these albeit I haven't dunked them in a river in mid-winter either (but have ridden all day/eve with moisture building and and freezing on me/clothing/bike). Cost is steep but I'm expecting many winters of use--and the cost to my fitness and sanity for not riding in the winter makes the expense bearable.

GOOD WITH FAULTS

  • Fit: True to size
  • Size Bought: 43

One of the warmest boots I have ever ridden. However it is not faultless. The boot is not waterproof. Road it several times in rain or snow mix with wet feet. Second, the boot is not compatible with all MTB cleats and pedals. I ride Crankbrother Candy's from Candy 1's to 3's. I have several bikes. None of them would allow me to clip out properly. Nearly killed myself until the service manager at Crankbrothers and I figured it out by trial and error. They had a few extra discontinued unadjustable cleats left over from the past that work well. The new versions simply wont work no matter how many shims you install. The tread on the cleat is too thick and close to work like it should. I tried to call Lake for some input but only was able to leave messages with no return calls. Also, I ordered a size up for thick socks and it was fine.

Nice boot for winter fatty riding

  • Familiarity: I've used it several times
  • Fit: True to size

I just got into fat tire winter biking (love it!). I use clipless pedals and wanted a winter boot that was clipless compatible. I will say that due to many prior near-frostbite situations, my feet get cold VERY easily.
These boots are super comfortable and I love the Boa closure system. I find them warm only down to about 25 degrees F. They fit true to size, but I went up one size to accommodate a heavy wool sock.
I added a set of Hotronics heaters to allow me to ride in temps down to 5 degrees F (cold enough for me).
P.S. If you use Crank Bros. pedals, make sure to install a set of their shoe shields.

Nice boot for winter fatty riding

Great winter biking boot

  • Fit: True to size
  • Size Bought: 48

I looked around a lot and settled on the Lake 303 for a winter boot for Fat Biking in Vermont. They have not disappointed. In fact, I have been delighted with them in every respect. The fit is true to size. The design is ingenious for a tight and secure fit. They have kept me warm invariably to temps in the single digits. I have ridden with them in all conditions- snow, rain, mud, hard, frozen ground. The Vibram soles are terrific for walking. I am partial to Vibram soles, and they make a great combination with the overall design of this boot. I could not be happier with the overall quality and performance of this product. I recommend them unequivocally as a premier winter boot, which will definitely improve the winter riding experience.

Winter need not be miserable

  • Familiarity: I've put it through the wringer
  • Fit: True to size

I live in Eastern Washington State where the winters are cold, but usually dry. A typical winter day can be in the 20's to 30's, but if it is dry, why waste an opportunity? My feet always run cold in the winter, and in the past I just put on more wool socks and stuffed my feet into my bike shoes and then use shoe covers. My feet were still near frost bitten (white and painful). Until I found these shoes. I thought it was a splurge, but my wife knows I am a real bike enthusiast and said she was going to order them if I did not. I could not be happier. They were a little stiff at first, but they moulded to my feet, and if I have time during the day and the weather has not turned my roads into an ice rink, I am out there!!! I did get caught in freezing rain storm, but with my winter gear and boots, I stayed safe and warm. My next winter purchase may be studded bike tires....As for fit, I wear a Shimano 48 and I got the Lake in a 48 and it ran true to size relative to Shimano (and my feet). If you love to bike in the winter, consider a pair. I road bike, and while heavy for a road bike (definitely won't be racing!!!), the point for me is to keep training through the winter on my favorite hill climbs. For the Lake's I have Crank Brothers Candy II pedals, and the cleats work fantastic on the Lake's

Avg. ride time: 4h 45m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Love these things

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: 43

The first thing I noticed is how comfortable they are. They are like having supprtive pillows on your feet. I have ridden through tons of mountin bike shoes, nothing comes close n terms of comfort. These are more comfortable than most regular shoes I have. They are not sized like regular Lakes, which I find to run large. I wear a 9 which typically equates to a 43. These were a perfec fit at size 43. So consisteant with shimano sizing. I have had these on rides down to 11 degree F, with wind chills down in the negertives, and the feet were still great. At that point they aren't warm, but they aren't cold either. 30 degrees and up and these are actally kind of hot. They are keep the water out and just work. Love these. Highly recommended.

Like walking on the butts of angels

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: 46

Maybe it's mercury poisoning from all the canned tuna fish I had to eat saving up to buy these beauties, but the moment I put them on I literally felt my feet had been wrapped in supple, bulletproof rainbows. I was a bit skeptical at first of whether these would truly be worth the money, and I even felt a subtle twinge of buyer's remorse after clicking 'buy', but the boots are definitely worth it.
First, I've been wearing them for commuting on my Surly Crosscheck in Philadelphia, and have used them a bit in snow on a fat tire in temperatures ranging from 12 degrees F (windchill was much colder) up to about 42 degrees F. Even riding on the coldest, gustiest days yet my feet have felt completely comfortable. On the warmest day, I could have used my summer biking shoes but wanted to test these instead, and I didn't overheat. That being said, these are not warm weather boots.
Second, they are supremely easy to clip in with. I use Time Atac MTB pedals on EVERYTHING and these boots are intuitive when it comes to clipping in. No problems there whatsoever.
Third, walking around in these is intensely pleasurable. Honestly one of the most comfortable boots to walk in that I own, and my other pair is a 15 year old pair of Danner's. These are legit. Very easy to transition from outdoor to indoor, and arent slick at all on wet tile, hardwood, etc.
Fourth, people WILL compliment you. The MXZ303's are so super sharp looking, I got 4 compliments on them my first day at work. Some of the best looking boots I've seen. Period.
Fifth, they are secure on your foot, but also easy to slip on and off before/after commuting due to their finger loop on the back and easy mechanism of ratcheting on/off. The neoprene upper wraps around socks, scrubs, or whatever and makes a damn good seal. I wear them under rain pants if it's a downpour and haven't had wet feet yet.
As for sizing, I heard they run small so whereas I normally wear a 45, I ordered these in a 46 and they fit perfectly with my smartwool socks. Snug, but just right.

IMPRESSION: A must have for deep winter cycling. Toasty, beautiful, comfortable, strong and easy.

Lake boots

  • Familiarity: I've put it through the wringer
  • Fit: Runs small
  • Size Bought: Xxl

Had to ho two sizes bigger but very warm and comfortable. I have been using them for a month now and can't say enough good.

Perfect for sloppy/cold rides in Chicago

  • Familiarity: I've put it through the wringer
  • Fit: Runs small
  • Size Bought: 43

I wear these for weekend rides and my commute to work. I am riding a BMC Cyclocross with Crank Bros. pedals and these shoes are perfect in 20 degree weather. Perfect in cold rain and slush. And perfect to get in and out of. They are ugly, but they work. I ordered a size up and wear only one pair of Assos socks with them.

Avg. ride time: 13h 1m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Pretty set on getting a pair of these to finally have warm & dry feet this winter. According to my measurements and Lake's sizing (283 x 107mm) I'd need a 45 regular, but I'm seeing sizing advice all over the board (runs small, runs true, runs big...) for both length and width. Not going to do anything weird like wear 2-10 pair of socks. Is the accepted practice to just order 2 pair in different sizes and keep the ones that work?

KC,

The size that worked best for me was the same size I've worn in all my cycling shoes.

Great Fat Bike shoe - available in wide

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: 42W

Looking for a winter mountain bike boot? This is the one. It's held up to temps in the 10's for 3 hour rides. It comes in wide width, which was key for me. Great closure system. Comfortable from the first ride.

Great boot, size accordingly

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: Runs large

Construction on these boots is great, and the materials, closure, and design give a strong first impression.
In terms of sizing, i feel the boots run large. I've always worn a US 8 and all my cycling shoes have been a EU 41, and I've always had a pinkie finger's width of room between my toes and the front of the shoe. Lake equates a US 8 to a EU 42 in their size chart. I tried on a 40, 41, and 42, and the 41s fit best, I had on a slim sock, but there was still room if I were wearing a warmer winter sock. The 40s weren't too small, but wouldn't have had room for a thicker sock. The 42s had more room than I needed. As for width, I don't wear a an E size shoe or anything, but my feet probably lean towards the wide end of normal. These weren't narrow feeling, and I didn't feel like the wide variant would provide a better fit.

Contact me with any questions here at Competitive at 801-736-6396 x4378, or jjakupcak@backcountry.com

Warm Feet

  • Familiarity: I've used it several times
  • Fit: Runs small

The Lake MXZ303 is a subzero rated mountain bike shoe. Comfort is outstanding in the 303. The neoprene around the cuff allows good movement while pedaling. The shoes also did not feel overly bulky when riding and had no issues with rubbing the stays. The Boa and velcro straps offer plenty of adjustability to dial in your needs. I’ve only worn these down to 20 degrees F and they were plenty warm.

For me, the shoes ran one size small. I wear a 42E in Shimano mountain bike shoes for reference and went with the 43 wide for the Lake and they fit great. If you like to wear really thick winter socks you may consider going another half size.

If you are searching for a winter shoe to keep your feet warm, take a look at the Lake MXZ303-X.

How are these boots sized? If I wear a Giro size 43.5/10 with regular cycling socks , do I get a Lake 44 if I wear thick wool socks or do I size up?

I'm not sure on Giro shoe sizing but for me these ran small so I sized up a full size from a Shimano shoe and it worked well. Hope this helps.

all good

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: 45

I went with the wide for my sensitive feet and am very happy. Bolted on my cleats and did a fat bike race for a first ride. BOA works well and strap is in the right place to keep foot snug. Sizing was accurate,(if in doubt go up) sole is not crazy stiff but fine to race and hikes OK. Finally found a winter shoe that's not narrow.

Warm Dry Feet Are So Nice!!

  • Familiarity: I've used it several times
  • Fit: Runs small
  • Size Bought: 46w

These boots are fanatic. I had been wearing covers for the last 3 years and had cold wet feet after every ride. I had considered buying winter boots every year but could not bring myself to spending the money. That being said I have not regretted the purchase one single second, minute or hour. My only regret is not buying them sooner. I am looking forward to riding this spring and see how they handle the wet slop that we face in Northwest Ohio. Follow the sizing charts that are online as they run small and I recommend wide. (normally 10.5 regular and 46 wide fit perfect)

Pay Attention to Sizes in Reviews

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: Runs small
  • Size Bought: 46

I normally wear a 10.5 shoe, I was apprehensive whether or not to order wide based on the reviews. I've never ordered wide shoes so decided on the 46 (size 12) normal width. They are a little snug in the midfoot area with wool socks but weren't worth returning them and going wide. They work fine for me and I'm sure they will break in and fit great. Just rode in 11F weather for 2 hours, feet got a little cold but not horrible. I don't think there is a perfect solution for riding in the extreme cold but this is as close as you can get.

Perfect winter cycling shoes

  • Familiarity: I've put it through the wringer
  • Fit: True to size

I have been riding these Lake winter shoes for the past month with my fat bike, having ridden in them in temperatures as low as -20C. Even at the temperature, my feet were still in good shape after 2+ hours (no toe warmers inserted). These are so much warmer than my road shoes with both booties and toe warmers. The additional sole insert makes a big difference in their warmth.



I have experience with Lake shoes as I ride their MTB/Cross shoes and the Assos-version of their top road shoe. I wear a 44 in each and have fairly narrow feet. Despite the other reviews here suggesting to go up size and wider in width, I didn't find the need for that. According to the Lake website, the Wide is 14mm wider than the Regular. That's a fair of a more width. So I went with my normal size in Lake, 44 Regular, and they fit perfectly even with a somewhat thicker winter sock.



You won't go wrong with these shoes whether in the snow on your fat bike or out on the road.

Avg. ride time: 3h 22m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Loved them but not quite wide enough

  • Familiarity: I returned this product before using it

As I started the search for winter shoes, the Lakes were at the top of my list. I have a pair of their road shoes, really like the boa system, and the reviews I read on forums checked out. My goal was to get something to keep my feet comfortable down to upper teens (Fahrenheit). I wear a 44W in road shoe so ordered 44W, 45R, and 45W since most people recommend sizing up for winter boots. Got the boots and really loved them--the boa worked like a charm and they felt great except for the width--just a little too tight. So I returned them for a 46R and 46W thinking surely that would do it but unfortunately had the same width issue with them as well and wasn't willing to go to a bigger size as they were already a bit long with the 46's and with paying that much for shoes didn't want to take the risk that they didn't stretch/give enough to be comfortable over time. So still think it's a great boot--really disappointed it didn't work with my feet and back to drawing board--will probably look at Shimano's or 45NRTH unless I can find a Northwave dealer close. Return process was very easy--very nice company to do business with.