Under Armour Base 4.0 ColdGearLeggins. This is the latest, heaviest addition and delivers the warmest performance ever. ColdGear Mega-Grid fleece is ideal for ultra warmth in brutal cold or lower exertion activities. The ColdGear Mega-Grid fabric with it's uniqe channels is engineered to trap heat for maintaining core temperature and quick drying moisture transport in the most brutal cold conditions. The base 4.0 leggins feature ergonomically placed stitching to ensure mobility and comfort. Fabric is 7.25oz. 96% pollyester and 4% elastane. Black.