Alltrack 90 Men's Ski Boots Colour:Black which is another way of Frame Lens:Tom Birch Lumalens Silver Ion w Lumalens Flash Blue Lens which is another way of ensuring that you stay dry 50% polyester response and control Optimized Hike Mode The lower boot shell is designed to offer a 50 degree range of motion in walk mode for efficient touring and maximum power for skiing when in ski mode Custom Comfort Custom liners offer internal customization for enhanced comfort and support GRIPWALK® Compatible (sold separately) GRIPWALK® soles feature a rubber tread and rockered toe for a more natural walking motion and increased traction Full Power Generative Design Grid minimizes boot wall thickness for the most effective use of material to reduce weight and enhance power transfer Better Skiability