The 1mm Round Toe Neoprene Heat Booster Socks are available in 4 sizes:

• Small: UK 4-6.5
• Medium: UK 7-8.5
• Large: UK 9-10.5
• XL: UK 11-12

Designed to wear inside all round-toe or swim fins, our new Round-Toe 1mm Neoprene Heat Booster Socks boost warmth by 5-10 degrees F. Bottom line: longer sessions in frigid water, where you can focus on performing, rather than freezing.

Tested by our top cold-water pros in slush-waves and water temps down in the low 30s, the 1mm Neoprene Heat Boosters now feature our Thermal Rebound internal lining fabric, increasing warmth by over 10%. For extra durability against the front of or fins, the toe-seams feature external Tatex LSS (Liquid Seam Seal).

Our 1mm Neoprene Socks are also quickly becoming a favorite as a swim-fin liner for ers, bodysurfers, and photographers, providing a comfortable buffer between feet and fins, and adding a bit extra warmth and protection. 

But wait, there's more! The low-friction surface means your can be taken off/put on very easily. Since the Heat Boosters are independent of your , they can be rinsed/dried very quickly to insure warm, dry feet for multi-session days.

1mm Neoprene Round Toe Heat Booster Socks can be used inside any brand of round-toe . Keep in mind the 1mm thickness takes up a little more space inside your (and more space than our regular Knit Heat Booster Socks), so if you are buying new , make sure there is a little room inside the to accommodate the 1mm socks.