SPEEDO Digital Evolution Endurance Axcel Back (26Y Only) SPEEDO Digital Evolution Endurance Axcel Back * Stylish print design. * Axcel back styling that features thin straps and maximum comfort. * Thin strap silhouette with reinforced overlap binding. * New and improved 100% chlorine resistant fabric. * Excellent support and freedom of motion. * Improved softer feel, lighter more stretch for a better fit. * Quick drying 20 times more color resistant than conventional swimwear. * Exclusive 9 thread flatlock technology for better fit. * Full front liner. * 50% Poly/50% PBT.