1.5 times warmer than regular HEATTECH. The brushed lining feels great against the skin and provides excellent protection against cold. Now in plastic-free packaging. - Uses HEATTECH for bio-warming, insulating, moisture-wicking, anti-microbial, and moisture retaining functions. - Made with fabric that is stretchy, soft, and great at maintaining its original shape. - With brushed lining material, it is about 1.5 times warmer than normal HEATTECH. - The item contours to the feet and keeps you warm. - This item features a high rise and will keep your stomach and waist warm.