Element Proof - Get dirty; your lens won't; the Universal Lens Cap prevents water, mud, and the finest dust and sand from mucking up your lens. With a lifetime warranty, your Universal Lens Cap is KUVRD (covered). Fits 99% of Lenses - It stretches from 60mm to 120mm and can be used as both a front and rear lens cap for ultimate insurance. Stack multiple caps on top of each other for extra protection. Withstands years of heavy use. Shock Absorbent - Smacking, bumping, or banging your lens is no longer a concern. The ULC absorbs most blunt-force trauma that could occur to both the front and exterior sides of the lens. Compressible - The ULC can be conveniently compressed to fit in pockets, wallets, socks, underneath armpits—you name it. Max Security - Once it's on, it stays on. You have to intentionally pull the Universal Lens Cap off to remove it. No more worries of losing lens caps. The 4-pack includes 4 Universal Lens Caps.