The X-Pro 90 from Salomon is the first boot in the line that is made with Salomon's 360 Degree Custom Shell. If you are an intermediate to advanced skier that has never had that perfect fit, Custom Shell is the answer for you. The shell of the boot can be heated by an authorized Salomon dealer for up to 15 minutes. Once the shell is heated it is placed on your foot, as the shell cools down it can expand to adapt the shape of your foot for total comfort. The Twinframe Construction uses a stiffer plastic on the sole of the boot to decrease the amount of torsional twisting at high speeds and increase the responsiveness while skiing. Salomon's 24mm Oversized Pivot delivers power and energy directly to the edges of your skis. A 35mm Strap will keep a firm wrap across your shin and increase the amount of leverage it takes to flex the boot for added responsiveness and control. If you need a boot that will be easy to dial in for your foot and increase the amount of control you have over your skis, the Salomon X-Pro 90 will be a great choice for yourself.