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- The ultimate thermal base layer, even in the most extreme cold. - Ultra Warm is 2.25 times* warmer than our regular HEATTECH. Updated fabric with a smooth, brushed feel. *Based on CLO values, which measure clothing's thermal resistance. Comparison with standard 'HEATTECH'. - High-performance fabric with Heat Absorption, HEAT RETENTION, and moisture-wicking comfort features. - A warm layer with a fluffy, brushed lining. - Stretch fabric allows easy movement even when layered. - Warm, high neck with a comfortable fit. 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.
- The ultimate thermal base layer, even in the most extreme cold. - Ultra Warm is 2.25 times* warmer than our regular HEATTECH. Updated fabric with a smooth, brushed feel. *Based on CLO values, which measure clothing's thermal resistance. Comparison with standard 'HEATTECH'. - High-performance fabric with Heat Absorption, HEAT RETENTION, and moisture-wicking comfort features. - A warm layer with a fluffy, brushed lining. - Stretch fabric allows easy movement even when layered. - Warm, high neck with a comfortable fit. 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.