Bc see thru covers - Butler Creek Blizzard See Thru Spotting Scope Covers

I've been using Butler Creek scope covers since the 90's. I tried a different brand only once and didn't care for them. Have been using Butler Creek only once. I currently have four rifle scopes outfitted with the see thru on my object and the flip up on my eyepiece. I've only replaced one in all these years. It was a see thru on a 50 mm objective that would not stay latched down. The replacement works fine.