The Gloves are designed with Thinsulate Lining & Velcro Strap - Soft and Comfortable. Thinsulate Insulation - Recommended for high activity levels where wearer generates a lot of body heat through activity or cool conditions. Shell: 100% Polyester / Lining: 65% Polypropolene, 35% Polyester. The original "Warmth without Bulk" -Won't absorb water - Adjustable Velcro Strap. Thinsulate insulation is one of the warmest clothing insulation's on the market yet still thin enough to allow complete freedom of movement.