The Mountain Warehouse Men's Keep The Heat Thermal Bottoms are crafted from a blend of materials including 37% Acrylic, 32% Polyester, 25% Viscose, and 6% Elastane. These bottoms feature a straightforward design. Performance-wise, they employ Isotherm technology for warmth retention, are lightweight, possess moisture-wicking properties, and boast a quick-drying capability. The ankles on these trousers are cuffed, while the waistline offers elasticated comfort.