Aqua Lung Sport Hingeflex Snorkeling Fins Sm/Med, One Pair New in box. Aqua Lung Sport Hingeflex Snorkeling Fins, Sm/Med,1 Pair. Fits Men's size 4-8 1/2 and women size 5-9 1/2. Electric blue and grey. Comfo strap, energy efficient, pivot flex technology, adjustable fin buckles. Compact design is great for travel! Super soft and Fits Men's size 4-8 1/2 and women size 5-9 1/2. Electric blue and grey. Comfo strap, energy efficient, pivot flex technology, adjustable fin buckles. Compact design is great for travel! Super soft and Compact design is great for travel! Super soft and comfortable foot pocket!