3mm neoprene hat with reinforced brim in blue, red or black. Optional design decal added on request (info@vitaminsea.ca). S/M is essentially medium, cut to be 54cm but stretchable. L/XL is cut to 55cm but also cut deeper (more volume).
Both sizes are stretchable to fit a variety of head shapes and sizes, but the deeper cut of the L/XL pulls down farther and will ride up more on a medium-sized head when your head moves around because it comes down 1cm farther in the back. Pictures show L/XL on both humans and mannequins.
