I’ve had issues with with pretty much every scope lens cover I’ve ever used. Most are either poor fitting or poor performing, and all of them seem far too fragile. That is until I found these Monstrum tactical covers. The primarily rubber construction not only improves fit but the flexibility definitely helps with durability. These aren’t perfect, but the best I’ve found so far and have them on 4 rifles currently. I’d love to hear if anyone has found any other good options, otherwise, I recommend these as an alternative to the “standard” ones I’ve seen in most pics.