Men's isothermal T-shirt with a crew neck and long raglan sleeves. Soft, elastic fabric, with a special weave on the chest and back, with helical embossed patterns on the sides, to ensure proper breathing and constant temperature regulation. Neckline, bottom and sleeves made of the same material for greater comfort. Ergonomic tubular structure and special ribs on the elbows, to ensure a perfect fit to the body shape. Composition of 66% polyamide, 26% polyester and 8% Elastane (polyurethane elastomer fibers).