This is not ballistic grade Lexan, but close. You can scratch the bottom if you try but the bottom is slightly concave so only the sides actually touch the bottom when the boat is flat on the ground. Obviously you wouldn't want to drag the boat across the sand. It's better to just lift it. The big 12' 2 person Caribe only weighs 63 pounds and has carrying handles on bow and stern. What scratches do occur on the bottom side of the hull disappear when wet.
The top side can be cleaned with polish that takes scratches out, but you would want to avoid the obvious things like walking all over sand on the transparent bottom. It's a specialy boat that does require a little consideration for its uniqueness, but not much. After years of wear, the lexan can be easily and quickly replaced for $200. The thought engineers put into this boat is something you find out with use !