Rating: • Extreme Wear, Colder than -20F. Colder temperatures apply if you choose to buy larger and wider sizes. Materials: • Foot: Rubberized moosehide foot. Super flexible treaded rubber sole. • Gaiter Fabric: MossyOak® BreakUp, waterproof Poly Tri-Laminate with PVC lining. • Cord Lock Top: 1/8" Nylon Cord Acetal/Nylon Pop Cord Lock • Calf Strap Assembly: 1” Black compression molded Strap Lock Buckle - 1000lb tensile strength. 1” Olive drab Polypropylene webbing - 800lb tensile strength per inch. • Ankle Strap Assembly: 1” Black compression molded Delrin Strap Lock Buckle - 1000lb tensile strength. 1” Olive Drab polypropylene webbing - 800lb tensile strength per inch. 1” Black Acetal/Nylon Strap Keepers to guide and hold back webbing. 1” Black Acetal/Nylon Uni-Loop on each side to guide webbing. • Boot Liner: 9mm Polypropylene lined woolfelt liner. • Insoles: 9mm woolfelt insoles, ‘trim to fit’. Steger Contour Insoles. Recommendations: We recommend that you purchase an extra pair of 9mm woolfelt liners and an extra pair of 9mm woolfelt insoles. Rotate your liners and insoles as needed. This is the optimum system Steger recommends for all expeditions, hunting trips, ice fishing trips etc. Socks: We recommend a pair of medium to heavy weight socks.