O\'Neill Heat Ninja 3mm Split Toe Wetsuit Socks in Black The O\'Neill Heat Ninja 3mm Split Toe Wetsuit Socks have been designed to offer a super simple, minimalistic feel. With a split toe to minimise slippage inside of the sock, encased in a neoprene sock-style look. The sock also features a velcro strap that helps keep these boots secure.  Features    Split Toe Minimal Design, Anti-Flush Shin Strap Durable Krypto Forefoot Fluid Foam Neoprene with Rubber Foxing Outsole