These thermals are perfect for men who want comfort all day. Whether you're at the gym for a workout or going about your daily activities, they've got you covered. The set includes a top and bottom, with two full sets in total. The sizing is as follows: S (Chest: 36-38', Waist: 30-32'), M (Chest: 38-40', Waist: 32-34'), L (Chest: 40-42', Waist: 34-36'), XL (Chest: 42-44', Waist: 36-38'), XXL (Chest: 44-46', Waist: 38-40'). They are made of 60% Cotton & 40% Polyester and are machine washable.