DaFiN Flex is the same design as our pro model but with a new softer, more flexible blade. Flex is great for beginning swimmers or as an addition to your quiver for recreational or distance swimming and snorkeling. The softer blade retains flexibility in cold water. Soft footpocket Flexible blade Fins float in salt water Lightweight and great for travel Fins can be worn on either foot Made with quality, natural rubber Dafins Weight: 1.3 – 3.0 lbs per pair (example: size ML = 2.4 lbs per pair) NOTE : If you have wide feet or are at the high end of the size chart we recommend going up a size and adding either a heel pad cinch or fliiper slippers for a better fit. 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. PLEASE NOTE : Some DaFin may come out of the box with an oil-like silicone coating. This is to aid the factory in the removal of the finished product from the molds. This water-soluble coating dries white and powdery on older fin stock but will not affect product performance. This will wash off after use or can be rinsed off under hot water. Swim Fins are made of natural rubber and may have minor imperfections or scuffs. These DO NOT affect the performance or lifespan of the product.