Our one-size-fits-all Scope Boot Cover stretches to provide airtight protection for 98% of today"s scope optics from 1? to 2.25? diameter. It stays attached to the scope and permits quick, easy opening for all shooting situations. * The Scope Boot Cover can be used with other optics such as compact or regular sized binoculars, spotting scopes and commercial optics which fall within its diameter stretch specifications.