These were the 1st really truly waterproof blankets around, and they're still one of the best. Nothing stays waterproof forever, but Rambos are one of the most durable turnouts around, and many people love the fact that they don't need leg straps. However, I almost wish they did have leg straps. The tail cord always gets manure all over it. I've even had D-rings added to my Rambos in the past so I could cut the tail cord and substitute leg straps. I also have had problems with the original Rambos rubbing the horse's shoulders. The Wug design doesn't seem to rub.