These unique Stainless Steel Spring Fin Straps are guaranteed to make Putting-On and Taking-Off your Fins Easier and include Rubber "Comfort Grip" Puller. The Rubber Comfort Puller provides a Cushion-between-the-Spring-and-Divers Heel and also provides a Large Grip to Aid in Pulling Fin Straps On-and-Off. Straps will fit on All Type of Adjustable Strap Fins except: Atomic, Dive Rite, Scuba Pro and Old Style Metal Buckle Fins without Quick Releases. Easy to use Springs Automatically Compensates for different Size-Feet and Boots Spring Fin Straps are Depth Compensating because they will Compress-to-Changes in the Thickness of your Boots. These Corrosion Resistant Spring Fin Straps come in 3 sizes of Small, Medium, or Large. How to select your fin Spring Strap: Insert your Dive Boot into your Fin Pocket with a Measuring Tape, Measure the Distance from the Center of One Strap Mount Pin on the Side of the Fin, around your Boot Heel, to the Center of the Pin on the other side of the Fin. Select the Spring Strap Size that is SHORTER than your measurement by 0.5" to 1.5" (1.3 to 3.8 cm). These unique EZ Spring Fin Straps come with a Limited Lifetime Warranty, including the Rubber Comfort Grip Puller. Below is a list of the actual fin strap sizes: Small:12-1/2"(32 cm) Medium:13-1/2"(34 cm) Large:15"(38cm) The Spring Fin Strap is commonly used for All Diving Applications, Cold Water, Extreme Depths, Professional, Recreation, Warm Water and more. The Spring Fin Strap is most used by customers who consider themselves to be a Advanced, Advanced Diver, Beginner, Casual/ Recreational, Professional, Recreational Diver among others. The Spring Fin Strap is popular because customers like the following qualities of the Spring Fin Strap: Easy To Use, Functional, Improves Diving Experience, Lightweight, Solid Construction, Stylish.