Avoid sharp reef underneath your feet with the 1.5-mm Reef walker. The "Gripper" sole extends slightly up the boot to increase durability and foot protection. Pull loops at the back ankles ensure this reef bootie slips easily on and off your foot. Great flexibility thanks to minimal seams. The "rolled" Smooth Skin ankle seal sits comfortably and flush against your skin for a better fit. Reinforced toes and heels ensure durability in all the right places.