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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
Thermosol composite insulated
fiberglass-injected high-impact nylon
Vibram Mountain V
Cleat Compatibility:
2-hole MTB
Recommended Use:

Size chart

Cycling Shoes

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 39 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
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   41   42 43   44 45   46 47   48   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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Here's what others have to say...


Great winter biking boot

  • Fit:True to size

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

  • Gender:Male
  • 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: 2h 12m 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

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

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

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

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: 10h 34m 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?


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

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


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 many grams of thinsulate in the toebox of these shoes?

These boots use 200g 3M thinsulate in the toebox.

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

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

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

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

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: 2h 36m 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.

Avg. ride time: 3h 39m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Good down to +15F

  • Familiarity:I've put it through the wringer

I replaced my old set of Lake winter cycling boots with these new Lake boots, but I must say the name "zero" must be 0C, not 0F because they have frozen my toes below 15F. To go below that you need vapor barrier socks over cycling socks with heavier socks on top of that. Given that they run much smaller than the previous version in the same size, that makes things very tight and pretty disappointing. I regret not purchasing the 45NRTH winter boots, which several friends ride below zero with regular wool socks. Too late for that after shelling out $250 on these.


Great boots, run small

  • Familiarity:I've used it several times

Excellent construction and great Boa closings. However, the sizing is definitely an issue. I normally wear 9.5-10 US men size, and I never had to use a wide fitting show. So I first tried size 10 regular. My toes were curling backward and my foot felt like it was squeezed in a vise. So I exchanged to size 12 wide and these fit quite well. They would be a bit big if I were wearing regular bike socks, but if one is using a boot as opposed to a shoe, it is because it is cold... and wearing a thicker wool sock (as in a ski boot) makes all kind of sense. With these thicker socks, the boots are fitting me perfectly. I have ridden them in 0-10F temps and my feet remained comfortable for ~ 2 hours. The sole only handles 2-hole cleat system (mountain bike). So I just bought a set of Shimano PD-M520 to put on my road bike for the winter. So go at least one size larger and wide when ordering. Then you won't regret it.


Great boot, sizing a little off

  • Familiarity:I returned this product before using it
  • Fit:Runs small

I really like the design of the boot, but the fit was a little off from my last pair. I'm exchanging for the next size up and should be good to go.