This rash guard is made with a mix of 80% polyester & 20% spandex for maximum comfort while training. These rash guards run a little small, so size up if you want a looser fit. Size Guide: XS: 99 to 132 lbs S: 132 to 154 lbs M: 154 to 176 lbs L: 176 to 198 lbs XL: 198 to 231 lbs XXL: 231 to 265 lbs |