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 while reducing the total seam stitch-count by over 60%. SHEDS Waterproof Breathable Technology HARS Insulation Technology Anatomically molded boot with a unique deep-fluted traction pattern grips, flexes and responds for maximum traction and stability 1600 gram Thinsulate Insulated Boot Articulated knee design for maximum range of motion Comfort Rating: -10 F to 50 F Degrees