Stay warm and stylish with Women’s ’HEATTECH' Leggings, UNIQLO's essential thermal base layer designed for cold-weather comfort and versatility. Engineered with advanced ’HEATTECH' technology, these leggings trap body heat and convert moisture into warmth, delivering lightweight insulation without added bulk. The stretchy fabric ensures a sleek, flattering fit that moves with you, making them ideal for layering under dresses, skirts, or pants. Whether you're heading out for a winter walk or lounging indoors, these thermal leggings offer reliable warmth and everyday easy style. - ’HEATTECH' Thermal Technology: Converts body moisture into heat for consistent insulation. - Heat-Retaining Lightweight Fabric: Keeps warmth close to the skin without compromising comfort. - Moisture-Wicking: Prevents overheating and keeps you feeling dry throughout the day. - Soft and Stretchy: Offers a snug, flexible fit without constricting. - Sleek Silhouette: Smooth finish ideal for layering under clothing. - Versatile Thermal Base Layer: Perfect for winter outfits, travel, or indoor 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.