ADJUSTABLE OPEN HEEL, GOOD FOR SHARING - Open heel design means each fin can accommodate a wider range of sizes, so family members or friends can share gear more easily. The best parts are that the filter pads inside the fins can keep the fins in shape during storage. COMFORTABLE TO WEAR SUPPORT DIFFERENT WAYS TO PUT ON - Carefully selected high-quality material, soft foot pocket, flexible enough for barefoot, but also can be worn with fin socks or diving boots that help protect a diver's feet from cold and blisters. (Reminder: please buy size up if you wear them with diving booties) COMPACT SIZE, PERFECT FOR TRAVEL - These short fins are a great 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 for pool or sea lovers or divers. QUICK AND EASY TO TRY AND ADJUST SIZE UP OR DOWN - Soft heel straps with large thumb loops, giving you an easy one-time fit and allowing you to easily put on and take off the fins. KIDS & ADULTS SIZE - 3 unisex sizes for kids, teens, young adults, adults (women, men). Generally, standard UK size 9-13 and UK adult size 1-3 should choose "Kids JR 9-13 S/MD" size. Young adults or adults whose height is between 3.5 and 7.5 should choose the size "S/M ", and the size between 8 and 12 should choose "L/XL ". Just grab the fins and enjoy your diving or swimming.