Stay warm and active in extreme cold with Men's 'HEATTECH' Ultra Warm Tights, UNIQLO's most advanced thermal base layer designed for superior insulation and comfort. Engineered with 'HEATTECH' Ultra Warm technology, these tights convert body moisture into heat, delivering maximum warmth without added bulk. The soft, brushed interior enhances heat retention while providing a cozy feel against the skin. With moisture-wicking properties, these thermal tights keep you dry and help you feel fresh throughout the day. Ideal for layering under pants or wearing on their own during outdoor activities, they offer a snug fit that moves with you.- 'HEATTECH' Ultra Warm Technology: Generates and retains heat for enhanced thermal insulation.- Soft Brushed Interior: Provides added warmth and comfort against the skin.- Moisture-Wicking Performance: Keeps you dry by quickly absorbing and evaporating sweat.- Stretchable Fabric: Offers a flexible, snug fit that moves with your body.- Durable Construction: Maintains shape and performance through regular wear and washing.- Essential Thermal Base Layer: Perfect for winter sports, travel, or daily cold-weather wear.Compare 3 Types of 'HEATTECH' Fabric:'HEATTECH'- Lightweight yet warm, ideal for everyday layering. - Recommended for 41 °F to 68 °F for mild winter days or cozy indoor wear. 'HEATTECH' Extra Warm- About 1.5× warmer than original 'HEATTECH', offering added insulation without bulk. - Perfect for colder days with recommended temperatures from 23 °F to 59 °F. 'HEATTECH' Ultra Warm - Our warmest option, approximately 2.25× warmer than original 'HEATTECH'. - Designed for more extreme cold with a recommended range of -4 °F to 50 °F.