2 pcs. Fins with strap with quick release mechanism Footwear with fins for outdoor swimming 16 mm Style A Description: [Material]: Adjustable, anti-loose buckle with quick release Universal shoe heel strap is made of TPR and PVC material, which is environmentally friendly, skin-friendly and age-resistant. It is flexible even at low temperatures. [Comfortable Design]: The quick release mechanism buckle makes it easy to put on and take off the fins. This product comes with two types of buckles (16 mm and 20 mm), making it suitable for fins with different connection sizes. [Spring Straps]: These diving fin straps automatically tighten without the need for adjustment. They have a simple design, yet are lightweight and durable. [Quick release buckle]: The quick release buckle makes it easy to put on and take off the fins quickly and conveniently. [Package Includes]: Each pack contains a pair of strips. Please note that due to the larger size and weight, these straps may not be suitable for smaller or lighter fins where size and weight may not be balanced. Specification: Material: TPR PVC Size Chart: S: Spring length 27,2 cm/10,71 inch for shoe size 36 to 40 R: Spring length 29 cm/11,42 inch for shoes in sizes 41 to 44 XL: spring length 30,5 cm/12,01 inch for shoe size 45 to 47 Buckle A: 2 cm/0,79 inch : 1,6 cm/0,63 inch Buckle C: 1,6 cm/0,63 inch The package includes: 1 pair of diving fin heels