Zone3's Heat Tech Swim Socks are some of the warmest available on the market. They are ideal if you suffer from cold feet or continue swimming from autumn through to spring. The 3.5mm high-stretch neoprene has a titanium lining that reflects body heat for increased comfort. Features include a Velcro cuff closure and 3D pattern on the sole for underfoot grip. Close-fitting, the longer length means you can tuck them into your wetsuit.