Where most leashes only have one size cap, Oakley's design team went further and created two different cap sizes for the right fit. The cap door expands and contracts based on the stem size of the sunglasses, making the Oakley Accessory Leash extremely versitile, able to fit any Oakley Sun/Sport/SI model. To top it off, the caps are made with TPE rubber, similar to Oakley's Unobtanium®, which prevents it from stick to the stem while maintaining form, fit and function. Features of Oakley Accessory Leash 18” Cord Allows for Better Comfort and Performance Angled Cap Design Allows Leash Cord to Rest Naturally On The Shoulders Each Cap Door Will Expand/Contract Based On the Stem Size Fits Eyewear with Larger Stems Oakley Accessory Leash Kit Large Black 103-059-004