S/M is for US 6 to 8, L/XL is for US 8 to 10,Please check the size chart before ordering,The designed size is perfecetly fit your feet, you will feel comfortable don’t feel loose or Squeezed, you just begin snorkeling or diving with put on a pair of socks.
OPEN HEEL SWIMMING FLIPPERS : Portable adjustment buckle for easier adjustment of elasticity Allows you to quickly and easily try on and adjust size up or down to easily put on and remove flippers. And fins can accommodate a larger range of sizes, so family or friends can share it more easily
SMALL SIZE AND EASY TO CARRY:The short 18-inch long size is perfect for traveling. This fin is suitable for snorkeling, swimming and diving. It is made of high-quality silicone, soft and comfortable.
BLANCE AND CONSOLIDATION &NON-SLIP?Foot bag adopts TPR material + PC + PP,Makes fins more Lightful and corrosion resistance and durability. And The bottom keel, straight and narrow, plays a role of balance and consolidation, effective anti-skid, and gives you more security protection
DRAIN HOLES DESIGN : Special drain holes design will effectively reduce the resistance in the water to increase your swimming speed,then increase the service life of flippers