Ski Boot Sizing: How Rental Ski Boots Should Fit

The piece of gear that ruins a day on the slope is usually not the ski — it's the boot. A tight boot numbs your foot; a loose one makes the ski impossible to control. The good news: choosing rental boots comes down to a few simple rules.

Ski boot sizes: Mondopoint

Ski boots are not sized like shoes but by the length of the foot in centimetres. This system is called Mondopoint. A size 26.5 boot is for a foot roughly 26.5 cm long.

Finding your size is easy: stand barefoot on a sheet of paper with your heel against a wall. Mark the tip of your longest toe and measure from the wall to the mark. Measure both feet — most people's feet differ slightly, and the boot is chosen for the bigger one.

Give the shop this measurement together with your normal shoe size, and the technician will quickly find the right starting size.

How should a ski boot fit?

A ski boot does not feel like an everyday shoe; it is meant to be snugger. In a well-fitting boot:

• Standing straight, your toes lightly touch the front of the boot.
• When you bend your knees forward (ski stance), your toes pull back from the front and relax.
• Your heel stays put. If it lifts inside the boot when you bend your knees, the boot is too big.
• There are no pressure points. The snugness should feel even; a single spot digging in by the ankle or on top of the foot turns into pain after a few hours.

Close the buckles and stand in the shop for at least five minutes, bending your knees. A boot that feels fine in the first minute tells the truth by the fifth.

The sock question

Wear a single, ski-specific sock inside the boot. Thick cotton socks or two pairs wrinkle inside the boot, hold moisture and make your feet cold faster. When trying boots, wear the socks you will actually ski in; boots chosen in everyday socks fit differently on the slope.

What is flex?

Boots also have a stiffness rating, called flex. A soft boot bends forward more easily and is more comfortable for beginners; a stiff boot transfers power to the ski more directly but needs an advanced skier. Most rental boots are medium-soft. Tell the shop your real level and they will choose the right flex.

Boots and the binding setting

The boot's sole has its sole length printed on it in millimetres. The ski binding is adjusted to this length — which is why boots are chosen before skis. If you change boots, the binding must be readjusted too, so always remind the technician when you swap to another size.

If your boots hurt on the slope

• Loosen the buckles, then re-tighten them evenly from the bottom up.
• Check that the tongue is straight and centred; a tongue that has slipped sideways creates pressure.
• If the pain doesn't go away, go back and swap. That is completely normal and the biggest advantage of renting.

At cold resorts such as Palandöken, letting boots warm up indoors before putting them on in the morning makes it much easier. At resorts busy with holidaymakers, like Davraz, trying boots before the morning rush saves time.

Once your boots are sorted, see our ski length guide, and before leaving the shop run through our pick-up checklist.