You can expect the same effect as you would experience in other top of the line rotational molded kayaks. If you hit a rock you most likely will bounce off. If you pin the boat against a rock with a large volume of water pushing against it (say, in large waves or river current), you will run the risk of crushing the thinner walled sections of the hull. Although our Pakayak is designed to meet or exceed the performance of the current available sea kayaks, it is the paddler’s responsibility to make good decisions and stay within their abilities for their safety. Of course, you should always paddle responsibly, never paddle alone, wear your PFD, and follow all local laws and regulations.