These innovative swimming socks are some of the warmest available on the market, perfect for those who suffer from cold feet or swim through the spring, autumn or winter. At 3.5mm they are slightly thicker than Zone 3's standard socks and come complete with a titanium lining to reflect the body's heat and improve warmth. A fantastic pair of socks to keep you warm and in the water for as long as you can manage. Key Features: High stretch 3.5mm thick neoprene with titanium lining. Liquid seal finish and Smoothskin closure system. Increased length with hook and loop fastening. 3D sole pattern grip. Double blind stitched, glue bonded seams. Part of a neoprene accessory range designed for year round training. Key Benefits: Secure and tight fitting to prevent water ingress. Warm and secure design. The ability to tuck into wetsuit. Grip and protection when entering and exiting the water. Neoprene Socks Size Chart Size UK US EURO XS 3 - 4 5 - 6 35 - 37 S 5 - 6 7 - 8 38 - 39 M 7 - 8 9 - 10 40 - 41 L 9 - 10 11 - 12 42 - 43 XL 11 - 12 13 - 14 44 - 45