Extremely lightweight and super-breathable, the T-shirt wicks moisture away from the body very quickly and absorbs almost no moisture. The shirt basically dries on the move, right on the body. The basic material of the T-shirt is 100% polyester with antibacterial treatment Polygiene, which significantly eliminates the smell of sweat. The double, shaped collar protects the neck from chafing from the backpack/vest straps, of course there are reflective accessories around the entire perimeter of the shirt. There are short sleeve, long sleeve and tank top designs. The weight is incredible, 64g in the men's version and 52g in the women's version!