The A3 Performance Xback is great for competition, training and lap swimming. Made of the ideal blend of chlorine-resistant polyester fabric and made with four-way stretch that provides great color fastness and excellent fit. Comfortable, lightweight and durable...the Xback will go the distance! 52% Polyester / 48% PBT, front lined. Double click on 2nd photo to see height and weight ranges for the available sizes. Order smaller size in your range for a tighter fit. Also, note that this chart was created through a survey of competitive youth swimmers (ages 10-18) and they tend to wear suits tighter/smaller than adults.