Snap-button top provides secure fit and easy on/off Reconfigured anatomical seam mapping mirrors body movement, dramatically reducing seam fatigue GO-FlastSeam assembly with single stitch design provides an ultra-smooth, lay-flat surface to securely seat Waterproof taping SHEDS Waterproof Breathable Technology Anatomically molded boot with a unique deep-fluted traction pattern grips, flexes and responds for maximum traction and stability 1200 gram Thinsulate Insulated Boot Articulated knee design for maximum range of motion Comfort Rating: 32F to 70 F Degrees