FEATURES Mesh Fabric Designed For Resistance Training - to be worn over your swimwear 100% Polyester Sizing: S 26-28" M 30"-32" L 34"-36" XL 38"-40" The Arena Unisex Drag Shorts are designed for resistance training giving your arms and legs a more intensive workout. They are made from a 100% polyester mesh fabric and are to be worn over your swimwear. A great training tool. Other colours are available.*feedback suggests that if you are unsure on what size to go for the next size up from what you would normally wear ensures a better fit