Your perfect ski boot: sizing, optimum fit and more

Tip: Always buy or rent ski boots that fit snugly, as the padding in the inner boot will expand by up to half a size after a few days on the slopes. It is particularly important that the boot fits snugly without pinching, as a loose fit can make it difficult to control the skis.

The best way to choose the right size is to measure the length of your foot in centimetres and refer to the size chart below:

• Relaxed carvers: Comfortable with a soft flex
• Sporty racers: Tight fit and hard shell for maximum control
• Touring ski boots: Lightweight and flexible with a walking function for ascents
• Women's ski boots: Tight fit and additional comfort for sensitive feet
• Performance ski boot: Comfort and stability for long days on the slopes
• Children's ski boots: Growing boots with extra protection and easy entry
• Freerider: Stable and durable with a harder flex for deep powder adventures

The flex index describes how stiff the boot shaft is when moving forward and is another important factor when choosing the right ski boot size. The higher the flex index, the greater the resistance on the shin. This provides more control and more precise power transmission to the skis, but limits the ankle mobility.

Important to know: Flex value is not standardised and can vary from manufacturer to manufacturer. Temperature also plays a role – it can increase by up to 20 % in cold weather.

The flex value that is right for you depends on your ability, your riding style and your weight. A high flex (e.g. from 100) is suitable for advanced skiers and racers who are looking for maximum stability and control. Beginners and recreational skiers will benefit from a lower flex (e.g. 60-80) for more comfort and cushioning.

For professional advice, we recommend a visit to one of our INTERSPORT Rent stores, where you can try out different models and other accessories.

Choosing the right boot depends on your technique, ability and preferred terrain. The flex value and advanced technical features are also key factors to ensure comfort, control and performance.

• All-mountain ski boots: Versatile all-rounders with a high level of comfort and good insulation, ideal for recreational skiers and a variety of slope conditions.
• Ski boots for beginners: Comfortable, easy-on models with a low flex value (60-80) for comfort and freedom of movement.
• Racing boots: Close-fitting, hard shell ski boots with a high flex value (from 100), perfect for precise power transmission and speed.
• Freeride boots: Rugged, high flex models with additional features such as Vibram soles, ideal for control in deep powder.
• Ski boots for kids: Comfortable boots with easy entry (e.g. rear entry) and a growth-friendly fit for the little ones.

Tip: As well as size, look at flex and technical features to find the perfect boot for your child's skiing style!

Learn more about ski boots

Custom-made ski boots ensure the best fit, optimum comfort and perfect support - essential for an enjoyable and efficient time on the slopes. Boot fitting is the process of adapting the boots to the shape of your feet, making pressure points and friction a thing of the past.

Boot fitting makes your boots not only more comfortable, but also more functional:

• Supports malposition such as fallen arches or splayed feet.
• Provides better support for narrow feet or wide calves.
• Solves problems caused by other individual foot shapes.

Benefit: A precise fit improves power transmission, giving you more control and stability when skiing.

Take advantage of the boot fitting service at INTERSPORT Rent: simply bring your ski boots and get them fitted - for maximum comfort and an unforgettable skiing experience!

Choosing the right ski boot size is the key to comfort, safety and performance on the slopes. From the precise measurement of your foot length using the Mondopoint system to the consideration of your skiing style, flex value and technical features, every aspect contributes to a better skiing experience.

Let the experts at INTERSPORT Rent advise you, test different accessories and enjoy the best that ski boots with the latest technology have to offer - for unforgettable days in the snow!

Surprisingly, the right fit for your ski boots depends more on how you ski! We recommend different ski boots for cosy cavers than for adrenaline junkies. Don't be surprised if you are asked about your skiing style when rent or buy your ski boots!

The correct size for kids' ski boots is also measured using the Mondopoint (MP) system, which is based on the foot length in centimetres. It is particularly important that the boots fit snugly but do not tightly, as children's feet are sensitive. Models with growth-friendly features such as back entry or adjustable inner shoes are an ideal accessory. Make sure the boot has the right sole length for the bindings and take the time to try it on with ski socks.

A well-fitting ski boot should touch your toes lightly without pinching when you stand. In the skiing position (knees slightly bent), the toes should no longer touch and the heel area should be firmly fixed. There should be no uncomfortable pressure and the boot should not rub anywhere. Always try the boots on with ski socks and make sure that the inner boot expands slightly after a few days.

Ski boot size should be checked regularly, especially for kids whose feet grow quickly. For adults, it is usually sufficient to check the fit before each ski season, as the padding and shape of ski boots can change over time. If the boots no longer fit well, it is advisable to make an adjustment or choose a new model.

If you have different foot sizes, always choose the boot size for the larger foot. For the smaller one, you can use insoles or adjustments using thermal processes to ensure a perfect fit. In many cases, specialist retailers such as INTERSPORT Rent offer professional boot fitting to ensure the best possible fit for both feet.