Orca Accessories Size Chart Our Neoprene Calf Guards have been designed specifically for Swimrun races. These give you extra buoyancy in the lower legs and avoid the need for a pull buoy which you then have to carry around for the run. Another advantage of wearing these calf guards over a pull buoy is that you're still able to kick in the swim, whilst also providing extra protection for your legs when clambering over rocks and running through undergrowth. Features: - Provides the extra flotability that is lost by wearing running shoes in competition. - 10-mm thick neoprene with SCS 38 cell treatment will help keep your legs from sinking, increasing your speed and improving your time in the race. - Helps prevent irritating scratches and bruises that commonly occur when running in competition in a natural environment, as the result of direct contact with stones or brambles, etc. - Compression fabric helps to reduce muscle fatigue. By using these Calf Guards, you'll quickly recover so you can go farther.