Scarpa Phantom Tech

Backcountry.com says:
With a combination of cold-fighting neoprene and durable defensive design, the Performance 3mm Split Toe Boot ensures comfort in warm weather and cool water. Heat-retaining WarmFlight lining with fleecy sections keeps our feet active and warm without sacrificing board feel the way a thicker neoprene would. The three-millimeter thickness is as protective as we need in rocky surf, and Roxy's reliable construction offers watertight seams that still deliver on flexibility.