Comfort gusset for improved fit Soft brushed inside maximizes the amount of warm air held close to the skin 160 Denier Cold legs can make a miserable winter day even worse. Super warm, Heat Holders® Thermal Tights, made from an advanced insulating yarn, have a soft-brushed inner pile that maximizes the amount of warm air held close to the skin, providing high performance insulation. The proven 0.52 TOG thermal ability of Heat Holders® Tights means you can trust them to keep you cozy! Heat Holders® Thermal Tights have built-in stretch, with an elasticated waistband and a comfort gusset panel, which improves fit and adds comfort for all-day wear.