When your feet are cold and you need to turn that notch up on the thermal dial, grab yourself a pair of O'Neill Heat 5MM Round Toe Booties. O'Neill crafts Heat 5MM RT Boots from high quality Fluid Foam neoprene throughout, and seals things up with durable glued and blindstitched seams. The excellent fit and protection stems from the Anti-Flush shin strap, a strong textured rubber outsole, and a torsion control forefoot.