Speedo Fastskin FS-Pro Recordbreaker Female - Size 20 [Black] WARNING: UNFAMILIAR FIRST TIME USER. THESE ARE DESIGN FOR COMPETITION AND TEND TO FEEL AND FIT 2 SIZES UNDER. Constructed from Speedos unique LZR Pulse fabric. Fit engineered from body scan data resulting in an optimum biomechanic fit. New Comfort Strap reduces shoulder pressure. Compression fabric reduces muscle oscillation and skin vibration. 4 Way Flat Seam are low profile, high strength stitched seams. Fabric: 75% Nylon/25% Spandex.