Features:The perfect balance of comfort and power.Fun for any water activity from swimming to bodyboarding.Fins float in salt water.Lightweight and great for travel.Fins can be worn on either foot.Made with quality, natural rubber.PLEASE NOTE:Dafin come out of the box with an oily silicone coating. This is to help remove them from the molds they are made in. This coating becomes white and powdery on pairs that have been on the shelf for a while. This washes off after use.Swimfins are made of natural rubber and will have imperfections/scuffs. These do NOT affect the performance or lifespan of the fins!Size Chart:XX-Small (M: 1-2 / W: 2-3.5)X-Small (M: 3-4 / W: 4-5.5)Small (M: 5-6 / W: 6-7.5)Medium (M: 7-8 / W: 8-9.5)Medium-Large (M: 9-10 / W: 10-11.5)Large (M: 11-12 / W: 12-13.5)X-Large (M: 13-14 / W: 14-16)XX-Large (M: 15-16 / W: 16-17.5)Note:Customers with extra wide feet (E and larger) benefit from sizing up.