The Burris Scope Cover is both waterproof and breathable which makes it the ideal cover for your Burris riflescope. Protect your scope during storage. These waterproof scope covers prevent corrosion and fogging. Made from super-soft breathable fabric that shields your scope from dust and dings. Small fits scopes 8.5 - 10.5 in. objective bells to 39 mm Medium fits scopes 10.5 - 13 in. objective bells to 48 mm Large fits scopes 13 - 17 in. objective bells to 61 mm