When cold-water swimming, these neoprene heat-tech swim socks are a must-have to prevent cold feet from becoming the Achilles' heel of your progression. Their slim-fitting design helps the water stay out, so you can stay in. After testing a variety of market-available swimming socks, Zone3 found that almost all the socks filled with water during swimming and slid down. To solve this, they created a new design that allows the socks to be stretched and tucked inside the wetsuit. This strategy, along with a liquid seal finish, delivers full-coverage protection while avoiding flush-through. At the top of each, there's also a hook-and-loop fastener strap to adjust the length and hold them securely in place. It's a simple solution, but one that's unique on the market. Additionally, the durable, non-slip grip soles provide added protection and control when getting in or out of the water and crossing slippery or unsteady terrain. These neoprene socks are available in three sizes - Small for shoe sizes 3-6, Medium for shoe sizes 6-10 and Large for shoe sizes 10-13.