Your Ski Boots Are Probably Too Big
Most skiers have been in the wrong size for years, sometimes decades. Here is how to tell, why it happens, and what to do about it, from a bootfitter who has fit close to 10,000 pairs.
Quick Answer: Most people ski in boots that are too big and have no idea. The number one cause is simple: your shoe size is not your ski boot size. Ski boots are measured in Mondopoint (the length of your foot in centimeters), and that does not convert cleanly to US shoe sizing. Most people are at least one full size down from their shoe size, and some are three or four. The signs of a too-big boot are shin pain, bruised toenails, heel lift, sloppy control, and having to crank your buckles all the way down. The fix is almost always a smaller boot fitted by a professional, because a bootfitter can make a boot feel bigger far more easily than smaller.
You have probably been the wrong size for years
I have watched countless people step up to my bootbench certain they know their size. They have skied the same number for ten, twenty, sometimes thirty years. And a lot of the time, it is wrong.
If you ski in rentals, I would bet over 90% of you are in the wrong size right now.
I am not guessing. Chris fits around 600 pairs a year and has been doing it for the better part of a decade, in our shop and in others before that. Between the two of us, we are closing in on 10,000 pairs of ski boots fit and sold. When I tell you that you are probably too big, it comes from seeing it over and over.
The best thing you can do is see a real bootfitter. I do not recommend buying boots online if you can avoid it. Sometimes you have to do what you have to do if there is no shop near you, but when you can get fitted in person, do it. It heads off almost every problem in this article.
The number one reason: shoe size is not boot size
This is the single most important thing to take away from this article.
Ski boots are measured in Mondopoint, an exact centimeter measurement of your foot. That measurement does not translate to US shoe sizing the way people assume. Shoe brands are not even consistent with each other, which makes the guess worse.
Here is a real example. I wear a size 8 in women's shoes, and I ski in a 23.5 boot. On a traditional sizing chart, a 23.5 lines up with about a women's 6.5. But my foot would feel crushed in a 6.5. I need the 8 in a shoe. The conversion just does not hold.
It is the same for men. One of our best selling boot sizes is a 27.5, and the second best is a 26.5. A 26.5 boot is roughly a men's 8.5 shoe, which is nowhere near the most common men's shoe size. I regularly have men in a size 11 shoe who measure into a 26.5 boot. I have seen people land three, four, even five sizes down from their shoe size. It sounds insane until you measure it.
So get the idea of a clean shoe-to-boot conversion out of your head. It does not exist. Most people are at least one size down, and many are more.
5 signs your boots are too big
Here is the tricky part. Almost every sign of a too-big boot feels like the opposite problem. People come in convinced their boots are too small or too tight, when the real issue is too much room.
| Sign | What you probably think | What is actually going on |
|---|---|---|
| Shin pain / shin bang | The top of the boot is too tight | Something is too big, usually length. The extra room lets your leg drive forward and hammer your shin. (Width and volume can cause this too. More in a separate article.) |
| Black or bruised toenails | My boots are too small | Too big. You are sliding forward into the toe because there is room to slide. A correct boot fits heel to toe, so your toes just brush the front instead of ramming it. |
| Heel lift | I can just buckle them down tighter | Too much room, usually length, sometimes heel volume. A brand new boot that lifts is a red flag. Cranking the buckles will not save a boot that is too big. |
| No control over your skis | It is my skiing, or my skis | Your foot moves before your ski does, so your energy lags. A snug boot transfers power instantly. A loose one gets dangerous in moguls, trees, and steeps. |
| Over-buckling | I just need to crank them down | If you have to buckle all the way to feel secure, there is too much room. A right-sized boot is tight on a light buckle. Cranking can also cut off circulation, which feels like too small but is caused by too big. |
Notice the pattern. "Just buckle them tighter" is the wrong instinct almost every time.
Why so many people end up too big
A few reasons I see again and again:
- Buying secondhand or online without a fitting. If the size came from a shoe size, it is probably wrong.
- Not being willing to go smaller. Sometimes people see a great bootfitter and still walk out too big because they would not try or buy the smaller boot. We can only advocate so much.
- Old fittings from a different era. Fifteen or twenty years ago there were fewer options, especially for tricky feet.
- A shop with limited stock. If they only had one or two boots in roughly your size, you may have ended up in whatever fit, not what fit best.
My tip: try on two or three boots. You do not need fifteen. But do not buy the very first boot you put on, either. Two to three is the sweet spot.
A note for wide feet
If you have wide feet and you are in older boots, you are very likely skiing too big, because for a long time you did not have a choice. It was either size up or have your foot fall asleep.
That has changed. Boots are built wider than they used to be, and we have real ways to modify a boot to make it wider. So if you have always gone big because of a wide foot, that does not have to be true anymore. Read the wide boots guide here.
What the right size actually feels like
Here is the hardest part of my job: getting people into the correct size, because a new, properly sized boot does not feel like a slipper. It feels tight. That is normal.
This is the speech I give every customer before I even put the boot on them:
When your foot drops into this boot, your toes are going to jam against the front. That is just because we are slipping your foot in. We still need to get your heel set back, buckle it up, and have you bend your knees forward before you judge anything.
Close to half of people say "too small" the second their foot goes in. Genuinely, it feels too small at first. That is how ski boots are, especially new ones. After two to five minutes of sitting in the boot, it almost always starts to feel better as your foot warms up and settles in. (This is brutal in spring and summer, when people have been in flip flops for months and forget what a closed shoe even feels like.)
So here is my number one buying tip: your toes have to touch the front. They have to. It might not feel familiar, especially coming out of rentals where you got used to room. But you can ski in a genuinely comfortable boot and still have your toes touch the front. My boots are comfortable. So are my coworkers' boots. All of our toes touch the front. That is simply how a ski boot is supposed to fit. (Most of this applies to snowboard boots too, if you do both. Toes to the front, snug fit. Plenty of people ride too big and give up performance for it.)
And please, do not ask to size up just to be comfortable. I hear it all the time, usually from parents or newer skiers: "I'm just casual," or "I'm only out here with my kids," or "I just want to size up so it's comfy." I promise you, that is not the answer. Sizing up causes more problems than being in your correct size. Do not go against your bootfitter's recommendation on this.
The one real caveat: being between sizes
Some people genuinely fall between sizes, and it is tricky, because ski boots do not come in half sizes anymore. They run in full sizes even though the numbers use a .5. These days a 26.0 and a 26.5 are the same shell. That was not true fifteen years ago, but it is now.
If your bootfitter tells you that you are truly between sizes, make the call based on performance. If you are a relaxed blue and green cruiser, the slightly bigger size is fine. If you ski aggressively, ski steeper terrain, or you are planning to get better, go with the smaller size. It will give you more control and you will improve faster.
It is easier to make a boot bigger than smaller
It is far easier for a bootfitter to make a ski boot feel bigger than it is to make one feel smaller.
This is the whole reason "go smaller" is usually the right answer. We can heat the plastic, stretch the shell, stretch and heat-mold the liner, and do a lot to open a boot up and make it more comfortable. We cannot shrink a boot. We can add padding to take up space, but we are not making the shell smaller.
And here is the kicker: most of the time, maybe 90% (my estimate, not a hard fact), what you feel at the front of a new boot is just a liner that has not broken in yet. Once it packs in, your toes relax a lot. In the right size they will still touch, but they go from "pressed against the front" to "lightly brushing."
At the fitter: come in open-minded
The best thing you can bring to a fitting is an open mind. Plenty of people put a boot on and will not even let me buckle it before deciding it is too small. I am not trying to jam you into something painful. I just need to try the smaller size first.
Here is the telltale sign. Put the boot on, buckle it, and give it a few minutes. If it starts to feel better, you are most likely in the right size. If it starts to feel worse, with tingling or real pain, that is a sign it is not the right size or the right boot for you.
How bootfitters know it is the right size
We measure more than length. We measure width and a few other things too. But for length specifically, here is one check I do.
When I bring a boot out, I do not put it on your foot first. I take the liner out, put your bare foot into the empty shell, and slide your foot forward until your toes touch the front. Then I measure the space behind your heel. That space tells me whether the boot is a tight fit, a good fit, or a roomy comfort fit.
Some shops use dowels for an exact measurement. I use my fingers, because I know my own hands and how they fit. It is personal preference. Here is roughly how it reads in my fitting style:
| Space behind heel | What it means |
|---|---|
| 1 finger | Race fit. Very aggressive. |
| 2 fingers | Ideal ski boot fit. Snug, not painful. |
| 3 fingers | Comfort fit. On the big side, but you can get away with it. |
| 4 fingers | Too big. (Fine only for a kid the parents know is growing. Never an adult.) |
For most people I am shooting for a snug two fingers. For someone who wants an aggressive fit, I am at one and a half, or even one. (Keep in mind, if you are measuring with a big guy's fingers, the numbers shift. This is my hand and my fitting style.)
"My boots feel too small. What can I do?"
First, I am going to double check that they are actually too small and not secretly too big, because so many people who say "too small" are really too big.
If they are genuinely tight and your toes hurt or something is not right, we have options:
- Liner mold. The quickest fix, about 15 to 20 minutes. We heat the liner, often with a toe cap (a little piece of foam over your toes that expands the toe box). You walk around the shop for ten minutes and come out with noticeably more toe room. The catch: this works on a relatively new liner. If your boot is ten years old, the foam is already packed out and this will not do much.
- Shell mold. If the liner mold is not enough, many mid to high end boots can have the shell molded. We put the whole shell in the oven, heat it, and put it back on your foot with padding where you feel pressure. That expands both the liner and the shell, so we can make the boot bigger right where you need it. (This does not apply to every brand or to low end boots.)
- Manual stretch. This is how it was all done before molding. We use a small hydraulic device and a spreader inside the shell, heat the shell, and stretch the toe, the width, or wherever you need it. We can still do this on top of a shell mold for a really demanding foot.
- Footbed or heel lift. Two of the easiest things we can do, even before you buy. A footbed is the most important aftermarket item for your boots, and most people should have one. Look in the bottom of your boot: if it is just a flat piece of foam and not real arch support, you need a footbed. Here is the part that sounds backwards: a footbed actually pulls your toes away from the front of the boot. You are adding something, so you would think it takes up space, but it gives you more room up front. I have seen the shock on hundreds of faces over this. Footbed equals toe room for a lot of people. A heel lift (a wedge under your heel) does something similar by pulling your foot back off the front.
"My boots are too big and I cannot replace them yet"
Maybe you just bought them, or a new pair is not in the budget right now. There are stopgaps. None are perfect, but they are easy to try:
- Bontex board. Basically a heavy duty fiberboard that goes under the liner to lift your foot into a tighter part of the boot.
- Butterfly wrap. My go-to. A piece of foam that wraps around your ankle and the back of your heel to lock the foot in. Very effective.
- Footbeds. They help here too, by supporting your arch and pulling your foot back into the heel pocket. Yes, that opens up the front, but when a boot is too big the real problem is your foot sliding around, so stabilizing it is the priority.
At the end of the day, if your boots are too big, the real fix is a new boot. These are patches to get you through. One nice thing: if you try footbeds in your current boots, you can move them straight into your new boots later, so it is not wasted money. You can get drop-in footbeds for around $60 at most ski shops, and you do not need a full custom footbed to start.
FAQ
Can my boots really be too big if my toes touch the front?
Yes, and this trips up almost everyone. Toes touching the front is correct. The question is what happens everywhere else: heel, ankle, instep. If your heel lifts, you slide forward when you ski, or you have to crank the buckles to feel secure, the boot is too big even if your toes touch.
My toenails are black. Aren't my boots too small?
Almost always the opposite. Black toenails come from sliding forward into the front of the boot, and you slide because there is room to slide. A correctly sized boot holds your heel back so your toes only brush the front.
How much smaller than my shoe size should I go?
There is no clean formula, which is the whole point. Most people are at least one size down, and plenty are three or more. The only way to know is to get measured in Mondopoint by a fitter.
Should I size up because I am just a casual skier?
No. Sizing up creates more problems than it solves, even for relaxed skiing. A correctly sized boot is more comfortable once it breaks in, not less.
I am between sizes. Which way do I go?
Base it on performance. Cruising blues and greens, the bigger size is okay. Skiing aggressively, tackling steeper terrain, or trying to improve, go smaller. You will get more control and progress faster.
Written by Alexis, head bootfitter at Aspen Ski and Board. Ten years fitting boots, trained at the Sidas Bootfitting Academy.
Ready to get fitted right? Come see us at Aspen Ski and Board.
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