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- The ultimate thermal base layer, even in The most extreme cold. - Simple crew neck with a T-shirt style collar. - Moisture-wicking for stay-fresh comfort. - Knitted fabric keeps its shape even after repeated washing. 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. - Simple crew neck with a T-shirt style collar. - Moisture-wicking for stay-fresh comfort. - Knitted fabric keeps its shape even after repeated washing. 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.