O'Neill Heat 5mm Round Toe Boot - The O'Neill Heat 5mm Round Toe Boot has been completely overhauled with new design features and attention to detail. This boot will give you traction in any water activity you desire. The upper is made with 5mm neoprene to keep your feet toasty warm and the shin strap on the top will allow you to seal in your body heat. The interior and exterior are made with Fluid Foam which makes the Heat 5mm highly durable and will better resist abrasion and will move with your feet. With a round toe design the O'Neill Heat 5mm boot will keep your toes closer together to conserve warmth.