- 1.5 times* warmer than our regular 'HEATTECH.' *Based on CLO values, which indicate the thermal insulation of clothing. Comparison with standard 'HEATTECH'. - Comfy 'HEATTECH' with 100% cotton on the inner side. - Ultra Stretch fabric moves with the body for comfort. - The mock neck keeps your neck warm and looks great layered under a cardigan or jacket. - Wicks away moisture to keep you feeling fresh.
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