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Lake MXZ 303 Winter Boots

Sale $259.99 - $289.95

Item # LKC000A

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  • Black/Silver, 40.0/Reg ($259.99)
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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...

How many grams of thinsulate in the toebox of these shoes?

Responded on

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

Unanswered Question

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?


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.


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: 7h 40m 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.

Will these work with a platform clipless pedal?

Responded on

Yes, These will work with any 2- hole mtb cleat system. Give me a shout and I can help you with an order.

Adam D

Office: 801-736-6396 ext 5630


Sizing is a challenge

  • Familiarity:I returned this product before using it

I did the Lake foot tracing and measurement. Unfortunately, it resulted in a boot one size too small. For me, the right Lake size is the same as my Sidi size, except in Wide rather than Regular.


Go Wide when ordering

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

I received the Lake MXZ 303's today and had to send them back for an exchange right away due to narrow sizing. I have never had to order wide shoes before these-I would recommend going with the wides unless you know you have a very narrow foot. Boots seem like a well built product-to bad I'll have to wait for them on back order AGAIN!


Go with the "wide" size

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

I just received my Lakes today and they look promising. I'll post a detailed review in a month or so, but I wanted to give some helpful sizing advice for others: go with the wide size unless you know that you need a very narrow shoe typically! I actually have slightly narrow feet, but these Lake 46 wides feel like a normal width shoe from other brands. I'm normally a size 11 US shoe size, and the Lake 46 wide feel like a typical US 11.5. This is perfect since I want a bit extra room to wear thick socks in the winter. The 45 Lakes feel a bit shorter than a US 11 to me and I'll be returning that pair.


Love these shoes

  • Familiarity:I've used it several times

I absolutely love wearing these shoes. Toes were warm and dry this winter. I do not like cold feet and these were the solution! I rode in negative 4 degress and my feet were happy.


Love at first sight

  • Gender:Male
  • Familiarity:I've used it once or twice and have initial impressions
  • Fit:True to size

First impressions after a few rides. I normally wear Sidi Dominator 44 mega and the Lake 44 wides are an identical fit. The shoe did not get wet after stepping down multiple times in wet snow ( unlike my sidi's) and were warm when pedaling. However, my feet did get cold (17F) on the down hill sections (which were pretty long, face got frosty too). I think some chemical toe warmers will help this next time. But each time I started pedaling back uphill they warmed up. The lacing system is awesome, I was initially worried about this. They are not bulky and are super comfy, I basically do not know they are there. I tried the Sidi Diablo's and did not like them. Would highly recommend the lakes for cold/wet trail riding in the snow.



  • Familiarity:I gave it as a gift but have feedback to share

If you're going to pay MSRP for these Lakes, then you should definitely also look at the 45NRTH Wolvhammer boot.

My friends all swear by their Lakes ... until it hits about 15-20F.. and then they start swearing AT them.