Blackstrap with secure ear pieces. Perforated panels. Matte silicone branding. Find Your Fit Run a piece of string around your head to find the circumference. Please note that size chart is to be used as a guide only. Wet Caps all come with the adjustable plastic ripples on the back to help you find the correct fit. We have had feedback that the fit on these caps is small so we recommend going a size up from your regular size. Cap Size Circumference Small 55 cm Medium 57 cm Large 59 cm