Heat Holders men's thermal underwear is designed to keep you warm and comfortable in the coldest weather. Made from 100% Polyester, these base layers feature advanced micro-fleece fabric with ideal stretch properties and comfort seams for maximum freedom of movement. The expert brushing process creates a soft, fur-like pile that traps warm air close to the skin, providing superior thermal performance. This 'Original' thickness is the heaviest and thickest option, perfect for extreme cold. The underwear also includes moisture and odour management technology to keep you feeling warm, dry, and fresh all day. They have an elasticated waistband for a comfortable fit and are designed to be worn as a smooth, slim-fitting layer under your regular clothing. Heat Holders base layers are machine washable at 30°C and can be tumble dried, though line drying is recommended for longevity. Available in various sizes.