Heatgen™ Maximum Thermal Long Sleeve Top

This maximum warmth thermal vest is ideal for wearing in extremely cold conditions. Designed in a regular cut with stretchy ribbed neck and cuffs for

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Marks and Spencer Heatgen review: We dressed heat-to-toe to test

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Our clever Heatgen™ technology uses an innovative fibre blend, helping your body to generate and retain heat so you can stay warm when the weather

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