The Speedo™ Solid Endurance + Brief is ideal training and recreational use. Built with Speedo™ Endurance fabric, it can withstand repeated exposure to pool chemicals without fading, stretching, or degradation. Speedo Endurance fabric, a new generation of durability and comfort exclusive to Speedo™. - Environmentally friendly fabric. - Highly resistant to fading, stretching, and degradation. - Even after repeated exposure to chlorine, bromine, oil or body lotion. Improved fit and comfort has a softer feel and superior shape retention. Quick-drying. 20 times more color resistant than standard swimwear fabric. 60% Polyester / 40% PBT. Imported.