How to choose your ski boots is a recurrent question in the world of skiing, and one which is unfortunately often difficult to answer for the person concerned, since there are so many variables to take into account depending on who you're talking to. Follow our guide and treat yourself to a successful ski season, giving your feet all the comfort they need to hit the slopes all day long!
Before you decide which type of shoe to choose, it's essential to determine which ski boot size is best suited to your feet..
"Why not just use my usual size to choose my ski boots" you might ask? Simply because ski boots use a different standard and unit of measurement, born almost 30 years ago: the Mondopoint.
The Mondopoint is a unit of measurement used by most ski boot manufacturers: it simply corresponds to the length of the foot in centimeters. This means that a ski boot with a Mondopoint size of 22 measures exactly 22 centimetres..


If this is your first ski boots purchase and you do not yet know your foot size, you can refer to the Mondopoint correspondence chart below::
| Mondopoint size | EU size | US size (Men) | US size (Women) | UK size |
|
21 |
33 | 2 | — | 1 |
|
21,5 |
34 | 3 | — | 2 |
|
22 |
35 | 4 | 5 | 3 |
|
22,5 |
35,5 | 4,5 | 5,5 | 3,5 |
|
23 |
36,5 | 5 | 6 | 4 |
|
23,5 |
37 | 5,5 | 6,5 | 4,5 |
|
24 |
38 | 6 | 7 | 5 |
|
24,5 |
38,5 | 6,5 | 7,5 | 5,5 |
|
25 |
39 | 7 | 8 | 6 |
|
25,5 |
40 | 7,5 | 8,5 | 6,5 |
|
26 |
40,5 | 8 | 9 | 7 |
|
26,5 |
41 | 8,5 | 9,5 | 7,5 |
|
27 |
42 | 9 | 10 | 8 |
|
27,5 |
42,5 | 9,5 | 10,5 | 8,5 |
|
28 |
43 | 10 | 11 | 9 |
|
28,5 |
44 | 10,5 | 11,5 | 9,5 |
|
29 |
44,5 | 11 | 12 | 10 |
|
29,5 |
45 | 11,5 | — | 10,5 |
|
30 |
45,5 | 12 | — | 11 |
|
30,5 |
46 | 12,5 | — | 11,5 |
|
31 |
47 | 13 | — | 12 |
|
31,5 |
47,5 | 13,5 | — | 12,5 |
|
32 |
48 | 14 | — | 13 |
|
32,5 |
48,5 | 14,5 | — | 13,5 |
|
33 |
49 | 15 | — | 14 |
|
33,5 |
— | 15,5 | — | 14,5 |
|
34 |
— | 16 | — | 15 |
Although this conversion table is useful to give you an idea of your Mondopoint size, you must remember that these conversions may vary depending on the manufacturer, and cannot replace a true measurement of your Mondopoint size. Many variables can alter the fit of a ski boot, depending on the manufacturer or even the model and range of ski boots..
To choose the right ski boot size for your anatomy, you need to measure your actual Mondopoint size.
Our selection of ski boots
Taking your Mondopoint measurement couldn't be easier. All you need are 4 very common accessories that you're bound to have at home::
Once you've gathered all your accessories, all that's left to do is follow these 4 steps::
Don't forget to measure both feet, as it's not uncommon to have feet of different lengths. All you have to do is take the longest length you measured. Now you know the exact Mondopoint size of your feet! We recommend, however, that you go for a Mondopoint size 0.5cm above your current size, to be a little more comfortable in your ski boots, but also because feet tend to swell during longer or shorter ski sessions..
We highly recommend downloading and printing the Sidas Foot Sizer to help you find your ideal ski boot size and width even more easily and accurately!!
More and more modern ski boots feature the BOA tightening system, and you may be wondering whether this makes any difference to your choice of size. Good news: BOA doesn't change the size you need, but it does revolutionize the way your shoes fit!
What is the BOA system?
Visit bOA system replaces the 2 traditional hooks at the bottom of the shoe (those that tighten the instep) with a tightening knob connected to a high-strength steel cable. This cable passes through low-friction guides that distribute tension evenly. With a simple turn of the knob, you can adjust the tightening millimeter by millimeter: each click corresponds to an adjustment of around 1 mm..
The concrete advantages of BOA for size selection
The real advantage of the BOA is that it wraps around the foot, rather than applying downward pressure as traditional hooks do. What does this mean for you??
The big difference is that the BOA will give you much more flexibility in fine-tuning the fit. If you're hesitating between two sizes, or if you have a foot with a particular volume (pronounced instep, wide foot), the BOA's micro-adjustment will enable you to find the perfect fit where hooks would have forced you to choose between "too tight" and "not tight enough". A real boon for those who've always struggled to find the right shoe!


With this information in mind, all that's left to do is take a look at our selection of ski boots and choose a model you like: our product data sheets are always accompanied by the Mondopoint size indicated by the manufacturer. Enjoy your shopping!!
Numerous brands are on show, with a wide selection of products including the famous rossignol shoes, the k2 ski boots, the illustrious salomon ski boots, the dalbello ski boots, the head ski boots or the atomic ski boots !