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Brand New Authentic H&M Thermolite Long Johns Base Layer Thermal Chill out, no need to overheat. Forward thinking fabrics, designed for your daily wardrobe. Available Sizes: Medium, Large M & S Men Heatgen Thermal Lightweight Long Pants - Ultra lightweight base layer made with Heather thermal technology - Suoersoft seams and heat-sealed care labels for maximum comfort - Flexifit fabric made with Lycra fiber for stretch and comfort Size Small, Medium Color Black