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- 1.5 times* warmer than our regular 'HEATTECH.' *Based on CLO values, which indicate the thermal insulation of clothing. Comparison with standard 'HEATTECH'.<br>- Comfy 'HEATTECH' with 100% cotton on the inner side.<br>- Ultra Stretch fabric moves with the body for comfort.<br>- Wicks away moisture to keep you feeling fresh. <br>- Perfectly-fitting innerwear that stays hidden under outer layers.

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