

Sizes: 2xl / l / m / s / xl / xs
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A pair of thermal long johns from M&S, crafted from brushed cotton for medium warmth and breathability. Designed with a regular fit, these long johns provide a snug and comfortable feel, perfect for cooler days. The Heatgen™ technology helps generate and retain body heat, making them ideal for layering under other garments. Sits comfortably on the body, offering a smooth and snug fit. Made for layering under trousers for cooler days, and as a base layer for outdoor activities in mild weather. Style with a pair of dark wash jeans and a flannel shirt for a casual look. Brushed cotton, machine wash 30°C.
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The M&S Heatgen™ White Thermal Long Johns is ideal for casual, everyday.
Pair with dark wash jeans and a flannel shirt for a casual, layered look.
The M&S Heatgen™ White Thermal Long Johns is made from cotton.
Editor's edit
Pair with dark wash jeans and a flannel shirt for a casual, layered look.
See all outfit ideasMarks & Spencer offers free returns within 28 days. Post back via the retailer's chosen courier (free), or in-store where available.
A pair of thermal long johns from M&S, crafted from brushed cotton for medium warmth and breathability. Designed with a regular fit, these long johns provide a snug and comfortable feel, perfect for cooler days. The Heatgen™ technology helps generate and retain body heat, making them ideal for layering under other garments. Sits comfortably on the body, offering a smooth and snug fit. Made for layering under trousers for cooler days, and as a base layer for outdoor activities in mild weather. Style with a pair of dark wash jeans and a flannel shirt for a casual look. Brushed cotton, machine wash 30°C.
Marks & Spencer — £3.99 standard delivery, free over £60.00 via Standard, typically 2-4 working days.
Marks & Spencer offers free returns within 28 days. Post back via the retailer's chosen courier (free), or in-store where available.
View Marks & Spencer's returns policyThe M&S Heatgen™ White Thermal Long Johns is available in sizes 2xl, l, m, s, xl, xs.
Second-hand alternatives to the M&S Heatgen™ White Thermal Long Johns on Vinted, Depop and other UK resellers.