Great for my coast headlamp - Butler Creek Blizzard See Thru Spotting Scope Covers

I know this is a scope cover and I love the idea of being able to use it to protect the lens and still be able to see through it. But I bought this particular one to go on my coast headlamp because it slides right over the focusing lens and protects my work headlamp better without running the risk of thinking that my headlamp was off when the scope cover was down.