I recommend this product with reservations - Butler Creek Blizzard See Thru Spotting Scope Covers

These scope covers are very fussy about fit. If you have to stretch them a bit to get them on they probably wont stay closed. They worked well on one of my scopes that just fit perfect. The other scope I bought them for the eyepiece fit well, but the objective end was tight and wouldn't stay closed. Had to go to next size up and add few wraps of electric tape. Returning covers for different size is hassle and shipping costs almost make it not worthwhile