Adjustable Open Heel Design, Good for Sharing - The open-heel design means each fin can accommodate a wider range of sizes, so family members or friends can share equipment more easily. The best parts is the filter pads inside the fins can keep fins in shape when store it. Wears Comfortably, Support Various Way to Put On - Carefully select high quality material, soft foot pocket, flexible enough for barefoot, but can also be worn with fin socks or dive booties which help to protect a diver's feet from the cold, and blisters. (Reminder: Please purchase sizes up if wear with dive booties together) Compact Size, Perfect for Travelling - This short fins is an excellent choice for avid travelers as the short blade is lightweight and compact, making it ideal for packing with ease. And it is a useful swimming aid either for pool or sea swim-lovers or snorkelers. Quick and Easy to Try it On and Adjust Size Up or Down - Soft heel straps with large thumb loops, giving you easy one-time adjustment and allowing you to easily put on and remove the fins. Kids and Adults Size - 3 unisex size choice for Kids, Children, Teens, Young Adults, Adults(women, men). Generally, kid’s US Standard Size 9-13 should pick size Kids JR 9-13 S/MD, Young Adults or Adults whose size is between 4.5-8.5 should pick size S/M, and the size between 9-13 should pick L/XL. Just take the fins and enjoying your snorkeling or swimming.