Marks & Spencer Heatgen™ Medium Thermal Long Johns (MALE, BLACK, XXL)

Stay cosy with these cotton-blend thermal long johns. Regular fit offering a medium level of warmth. Made from an insulating brushed-back cotton blend that's breathable for extra comfort. Finished with ultra-soft seams for snugness. 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.