M&S Heatgen™ Medium Thermal Long Johns - M - Grey, Grey

These thermal long johns provide medium warmth with a regular fit, perfect for cooler days as a base layer underwear. The insulating brushed-back fabric offers breathability for lasting comfort, while comfort seams ensure a snug feel. Featuring Heatgen™ technology that helps generate and retain body heat when temperatures drop, making this undergarment ideal clothing for layering.nnM&S Collection: easy-to-wear wardrobe staples that combine classic and contemporary styles.