Comfortable: Silicone Scuba Fin Straps, Diving Fin Foot Pocket, Elastic Shoe Strap, and swimmers to concentrate on their strokes. swimmers can focus on their strokes and enjoy a comfortable. Quality Material: Made of silicone material that is soft and elastic, effectively preventing the fins from falling off due to water resistance. Increased Agility: our inner side is smooth to ensure it does not chafe your feet, also improves speed and efficiency in the water. great for adult and child swimmers. Swim Paddle Straps: This 3 Arm Y shaped strap design, high elastic to fit over but enough staying power to keep your fin. Widely Use: Great accessory for diving, snorkeling, swimming, surfing or other water sports. Size Chart:XXS: Support size 5.5cm/2.17inch, suitable for foot size 34cm-35cm/13.39inch-13.78inch; Package Includes: 2Scuba Fin Straps(4 Pack) Note: Please allow slightly errors 1-2cm differences due to manual measurement.