Neo-Sport 5 mm. XSPAN Sock The Neo-Sport 5 mm. XSPAN Sock is a great new way to stay comfortable and warm during all your water activities. It features 100% XSPAN (5 mm.) with 250% 4-Way Super-Stretch Foam Neoprene Rubber to make it ultra-soft and comfortable for you to wear in the pool, or while diving in the lake. It comes with glued and blind-stitched seams to give you a soft inner layer and a durable exterior for long-lasting comfort. There is a reinforced screened bottom that provides durability and prevents slippage. Extremely versatile, you could also use this pair of socks for layering when you're putting on thick boots. It is available in many, easy-to-pack sizes for your convenience on trips. For a great day in the water, get the comfort of the Neo-Sport 5 mm. XSPAN Sock.