Fourth Element Thermocline Fin Socks are comfortable lining socks for full-foot fins and neoprene boots. Thermocline Fin Socks are constructed using flat lock stitching and fleece-lined fabric. This minimises abrasion from full foot fins and allergy reaction to neoprene boots whilst eliminating the risk of sores or blisters from rubbing.

Worn underneath neoprene boots, Fourth Element Thermocline Fin Socks help keep the feet a little warmer and assist with donning a wetsuit by providing low-friction contact between the feet and the inside.

Thermocline Fin Socks are also ideal for children and young adults whose feet are still growing, as they can help a pair of fins that are too large fit better and last longer.