The Reef X-S-1 is a high tech sandal with powerful features from our Performance footwear line. Walk, run, and even tread through water in an athletic sandal that was designed for extended, active wear in any kind of terrain. The footbed has special drain holes to release excess water that may potentially cause slippage. A thicker, more high tech, heel area provides maximum support and shock absorption. The mini trampoline feature is a similar design to what you see in running shoes and provides stability and adds power to your stride.