Check the listing for details. ScopeGuard Alaska Neoprene Scope Covers. Replace Those Clumsy, Breakable Flipups. Condition: New. Listed at 18.95 USD. ScopeGuard Alaska originated as ScopeShield Alaska, which made these remarkable covers so well known. Only the name has changed! The stretchable 2 mm neoprene protects scope lenses from dust, rain, snow and general goo, releases instantly in the field, and yet is retained on the rifle by the keeper loop. In use by demanding hunters around the world, ScopeGuards ideally fit snug, to seal the rims around the scope lenses. Best fit is achieved by selecting an SG size about 1 inch shorter than the scope body length. For example, if your scope is about 13 inches long, select an SG12. But don't worry, they are very forgiving in fit because they stretch! Standard ScopeGuard Alaska covers fit beautifully on scopes with up to 56mm objective lenses, and function magnificently in scabbards, snow machine racks, and anywhere the hunter or shooter needs to keep the scope lenses clean and clear until the moment of the shot opportunity.