Heatwave technology the heatwave kinetic heat return system amplifies your body heat and reflects it back to you in dual stages, keeping waves of heat in. Look for the silver lining 1. Kinetic energy converts emitted energy into increased heat amplifying the temperature inside the glove by 4-5 degree 2. The reflective layer radiates heat back for 20% more warmth. INSULATION: 240g HeatLock INSERT: Dryhand waterproof breathable SHELL: CompTech PALM: ToughTek FEATURES: Heatwave Lining UPC 090897089479 Size Medium Color Black Material Blend Brand Name Seirus Fabric Type Shell: 95% Polyester/5% Spandex; Palm: 55% Polyamide/45% Polyurethane; Lining & Insulation: 100% Polyester Item Weight 5.6 ounces Part Number 090897089479-Medium-124 Closure Type Pull On Manufacturer Seirus Innovation Style Number 1023 Item Type Name Glove Included Components Gloves Age Range Description Adult Product Care Instructions Machine Wash Global Trade Identification Number 00090897089479