ColdPruf Men's Platinum II Heavyweight Base Layer Pants - Designed with two-layer engineering traps air between layers providing a natural barrier of warmth to keep you comfortable all season long. Inside Layer: 100% ColdPruf(R) Technical Fiber Polyester with SILVADUR(TM) Intelligent Freshness Very Cold to Extreme Cold - Medium to High Activity Outside Layer: 70% polyester / 30% Merino Wool Fabric weight: 7 oz. Comfort Waistband Rib Cuffs Front and Back Rise Regular Fit Style: 75B