SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only)SPEEDO Sonic Surf Endurance Axcel Back (38-40 Only) * Axcel Back styling features sleek, thin straps and an open back. * Speedo? Endurance is 100% chlorine resistant fabric that lasts 20 times longer than ordinary spandex fabrics. * Speedo? Endurance fabric retains color 20 times longer than conventional swimwear and features softer, lighter fabric with 4-way stretch technology for a comfortable fit. * Exclusive 9 Thread Flatlock Technology for stronger seams, better fit, and optimal stretch. * Bar tack reinforcements at stress points. * Full front liner. * Fabric: 50% Polyester/50% PBT.