Heatgen™ Medium Thermal Short Sleeve Top, M&S Collection

Keep warm during the chilly months with this cotton-blend thermal vest. Short-sleeved style, designed in a regular fit with a medium level of warmth. Breathable fabric, made from an insulating brushed back cotton blend. 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. We only ever use responsibly sourced cotton for our clothes.

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