These HUUB Neoprene Swim Socks or Booties as some people like to call them, have a protective reinforced sole which provides ‘non slip’ protection and abrasion resistance and a split-toe design to avoid 'rolling' on the foot. They also have adjustable velcro closures to make these neoprene socks suitable to be worn either over or under your wetsuit.
HUUB Neoprene swim socks, are worn to protect the feet from hard ground, stones and sharp objects. The 3mm neoprene also help to keep your feet much warmer for both training and when allowed in races (when conditions are very cold and if allowed by the race organiser).
The socks are unisex but based on Mens Sizes:

Small - Up to UK size 6
Medium - Up to UK size 9
Large - UK size 9+