The lightweight AquaTech ASCC 4 SoftCap can be used instead of the leather style caps that are sold with Canon and Nikon cameras.This AquaTech SoftCap  is made from silicon and it perfectly fits the end of the lens barrelYou can use the AquaTech ASCC 4 SoftCap with both current and the older lensesThis SoftCap is compatible with the Canon 400mm F 2.8 Lens and AquaTech's    SoftHood collapsible fabric hoods