Package Contents: Each package contains a pair of swimming fins with adjustable straps. You can easily adjust the strap length to find a comfortable fit without hindering blood circulation in your hands. Effectively prevents hand numbness caused by prolonged swimming, ensuring a safe and comfortable wearing experience. Premium Material: Made of high-quality PP material and flexible silicone straps, these swimming fins are sturdy and durable, resistant to deformation or bending. The lightweight design minimizes pressure on your arms/hands during swimming. The smooth surface feels comfortable, allowing you to fully concentrate on swimming. Convex Design: These swimming fins feature a convex design that enhances grip in the water. The added resistance increases forward speed and effectively trains arm muscles (biceps, triceps, shoulders). Suitable for beginners and advanced swimmers at various training levels. Ergonomic Shape: The ergonomic design conforms to the contours of the palm, reducing hand pressure and providing a natural grip. Multiple drainage holes reduce water impact and prevent muscle strain. Smooth and natural strokes help muscles grow safely. Versatile: Suitable for various swimming styles including freestyle, backstroke, and butterfly. Ideal for beginners to improve skills, enhance physical fitness, participate in team training, or conduct individual training. In addition to swimming, they are also excellent for diving and snorkeling.