Durable and lightweight swimming fins that stay undeformed, delivering reliable performance and a long service life. Snorkel fin adjustable buckle for versatile sizing, providing a secure fit for different foot sizes and reducing slippage. Ideal for snorkeling excursions, pool training, or family beach trips, offering practical versatility across activities. Suitable for diving, swimming and recreational water sports, supporting efficient kicking and comfortable wear in varied conditions. Use scenarios: 1) Snorkeling excursions: use the adjustable buckle to fit different family members, enjoy comfortable kicks and longer reef exploration sessions. 2) Pool training: practice consistent, powerful kicks during drills, improving propulsion and technique without frequent resizing. 3) Family beach trips: share across adults and children with an easyfit buckle, enabling multiple users to participate in water activities.