Soft knit fabric with anti-pilling treatment is lightweight and breathable. The material wicks away sweat and dries very quickly. UPF 50+ protects the skin from the sun's harmful rays. Pocket on the right side for energy gels or small essentials. Thumbholes help keep the sleeves in place and keep you warm. Odor control technology minimizes odor. The main fabric contains at least 80% recycled polyester excluding hems and embellishments.