Heatgen™ Maximum Thermal Long Sleeve Top, M&S Collection

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 an improved fit. Long sleeves and a ribbed texture with super soft seams for ultimate comfort. 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 gets chilly.

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I dressed all over in M&S thermals to see if it saved putting the heating on' - Staffordshire Live