Adjustable Open Heel Design: Adjustable laces make it easy to adjust to foot shape and size. Quick release buckle, it can keep the length of the strap to the length you set. The strap is also great as a carrying handle. Made of High Toughness Material:jet fins are made of high-quality TPE+TPR material, which can increase diving speed and enjoy the fun of snorkeling. Our long fins are anti-deformation, flexible, environmentally friendly, durable, corrosion-resistant, more comfortable to wear and fit the shape of your feet. Perfect Diving Partner:jet fins are designed with hydrodynamic design, high-tenacity keel, and diversion groove design, which enhances the strength of the fins and reduces resistance while providing greater stability. Anti-slip design on the bottom: The three-dimensional bump design on the sole enhances friction and prevents slipping underwater. It also improves joint flexibility and improves kicking movements, making it safer and more secure.