Rossignol ALLTRACK 90 - Ski Boots - Women's - acid yellow

3M? Thinsulate?: These products retain as much heat as possible on a smaller surface area. The technology is warm, lightweight and offers excellent freedom of movement in both clothes and boots, even in cold weather.

Thinsulate is a material made up of fine synthetic fibres that store a lot of air and help ensure warmth.

The 3M company is renowned for its numerous innovations, already found in Neil Armstrong's gear.

The special Thinsulate Insulation fibres ensure a high level of comfort as well as efficient breathability and anti-moisture action, even when practising sports that generate a lot of sweat.

Sensor Grid:?Two internal widths based on the same structure to offer a close and anatomic fit. This technology reduces the shell by 10% (refining and enhancing its rigidity) and improving accuracy with a diagonal frame position.

Women's Thermo Optisensor 3D T2:?Women's specific fit liner. The hardness of the materials used is adapted to each area of the foot. Soft on the ankle bones and on the instep.

102 mm LAST:?102 mm foot width aimed at skiers with a large foot size or skiers looking for added comfort over a long period of time.

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FLEX INDEX:?The flex is the boot's flexibility index. The greater the flex, the more rigid and reactive the boot. On the contrary, a soft flex will be more tolerant and comfortable. The flex of your boot is chosen in relation to your skiing level as well as size.

Men's Flex Index:

• Flex from 60 to 70: beginner to intermediate
• Flex from 80 to 110: intermediate to advanced
• Flex above 120: expert

Women's Flex Index:

• Flex from 50 to 70: Beginner to intermediate
• Flex from 80 to 70: Intermediate to advanced
• Flex from 100 to 110: Expert

Important: A flex that is too rigid for the average skier will impede progression. For a heavy and powerful skier, it is essential to increase the flex.?