Static Axel Hoody Athletic Black Men's L Thin, lightweight, simple synthetic base layer. The skin-facing side has a grid pattern, providing a good balance of sweat wicking, feel, warmth, and breathability! This is a great piece for winter running and hiking! It also works well in combination with a shell or vest. The fine grid on the skin-facing side creates contact points with the skin, reducing discomfort when you sweat. It also enhances sweat absorption and diffusion, and is structured for high breathability. Gender: Men