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- ‘Extra Warm’ is 1.5 times* warmer than our regular 'HEATTECH.' *Based on CLO values, which indicate the thermal insulation of clothing. Comparison with standard 'HEATTECH.'<br>- 100% cotton on the inside, brushed for extra softness.<br>- Ultra Stretch fabric conforms to the body for a perfect fit.<br>- Versatile crew neck design with a T-shirt-style collar for easy layering. <br>- Knitted fabric keeps its shape even after repeated washing.

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