Lighter than manufacturers' hoods Compresses when not in use and does not need to be reversed Fits any 300mm f/2.8 or 500mm f/4 lens Resistant to moisture and abrasion The AquaTech Soft Hood, being light and collapsible and very difficult to damage, is a practical alternative to the originally-supplied metal or carbon fiber hoods that you find with the enormous lenses for SLR cameras. This particular model fits any 500mm f/4 or 300mm f/2.8 lens; it comes with a pair of compression straps to perfectly affix the Soft Hood to the outer diameter of your lens barrel no matter the maker. Soft Hood's faster to deploy than a 'reversed' normal hood since you just extend it from its collapsed state, and of course with a name like Aqua Tech it was designed with excellent water resistance in mind.
