Product Name: Adjustable Open Heel Diving Fins for Swimming and Snorkeling Features: 1. Adjustable Open Heel Design: Ergonomically designed for strong stability, greatly improving swimming speed. The anti-slip bottom design enhances joint flexibility, improves kicking, and reduces leg fatigue. 2. High-Performance Material: Made from a TPE upper that has low water absorption, shock resistance, heat insulation, and moisture resistance. The blade is crafted from dual-density high-performance engineering material, combined with a third silicone-based material to create a channeling effect for enhanced water flow. 3. Comfortable Fit: Constructed with high toughness material that is durable and resistant to aging. The soft foot pocket is flexible for barefoot use and can also be worn with fin socks or dive booties to protect feet from cold temperatures and blisters. 4. Compact and Travel-Friendly: The short blade design makes these fins lightweight and compact, perfect for packing while traveling. Ideal for both pool swimmers and sea swimmers or snorkelers. 5. Increased Swimming Speed: The diversion ditch design changes the direction of water flow, effectively increasing swimming speed. Specifications: Sizes Available: S: Shoe Length 48.5 cm, Recommended Size 36-37, Weight 380g, Dimensions 48.5 cm x 19 cm M: Shoe Length 50.5 cm, Recommended Size 38-39, Weight 420g, Dimensions 50.5 cm x 24.5 cm L: Shoe Length 53 cm, Recommended Size 40-41, Weight 480g, Dimensions 53 cm x 26 cm XL: Shoe Length 55.5 cm, Recommended Size 42-43, Weight 535g, Dimensions 55.5 cm x 27 cm Package Includes: 1 x Diving Fins