Snorkeling Fin Spring Heel Strap Diving with Open Heels Flipper Straps Red S Description: -Replaceable diving fins spring-loaded heel straps made of 304 stainless steel and rubber-durable, flexible -Suitable for most open heel fins, such as watercress, mares, but not for Gull Coco fins. - To make sure it can be used, measure the distance between the base (14mm or 20mm. ) -Designed to keep fins and fins from slipping off -Using a quick release buckle allows you to easily put on and take off the fins Specification: Material: 304 stainless steel POM TPR Product Size: XS: 270x30x10mm or 10.6x1.18x0.39 inch S: 295x30x10mm or 11.6x1.18x0.39 inch M: 305x30x10mm or 12.0x1.18x0.39 inch L: 325x30x10mm or 12.8x1.18x0.39 inch Size Chart: XS: Suits Heel circumference: 25.5-29cm or 10.0-11.4" Shoe Size: 34-39 inches S: Fits Heel circumference: 28.5-32cm or 11.2-12.6" Shoe Size: 38-42 inches Bust: 95-99 cm or 37.4-39 inches Fits Heel circumference: 31-34cm or 12.2-13.4" Shoe Size: 41-44 Inch L : Fits Heel circumference: 33-38 cm or 13.0-15.0" Shoe Size: 43-48 inches The package includes: 1 Pair Spring Diving Heel Strap