To deliver superior performance Callaway have used a conforming stretch fabric that features an engineered heel and 360 arch support as well as an asymmetric fit. Mesh panels have been incorporated into the design to improve moisture-wicking and breathable performance allowing for year-round wear. Conforming Stretch Engineered Heel 360 Arch Support Asymmetric Fit Mesh Channels Cushioned Foot 85% Polyester, 15% Spandex