The Oakley Eyewear Accessory Leash is great for those who lose their glasses regularly. This leash allows you to attach each end of your leash to your glasses so when you're not using them, they can hang around your neck comfortably, and you don't have to worry about setting them down somewhere. Size ChartSize is dependent on frame size, not leash length.Large: Fuel Cell, Gascan, and Batwolf styles of eyewearSmall: Covers all other Oakley models