Last year I purchased a Zoik Inflatable out of Durango,CO. I cannot say anything bad about it yet. It has no protective covering, and has stood up to many rocks. Not having a covering also makes it fairly light weight, @ 36lbs. I has great rocker, which allows for less water, and the drain holes are quick to get rid of the water you do take in. One other thing that helps with this is its lifted floor. The floor sits 5 inches above the bottom of the side tubes. This not only helps draining water, but makes it extremely stable. There is not much side to side rocking at all. I ran some class V rapids last year and had a great time, no flips at all. I highly recommend the Zoik brands.