Not usually much swimming. The boats are ridiculously easy to roll compared to most WW kayaks. You're also so tightly squeezed into the boats, that it'd take 5 - 10 seconds to get out, so most don't try it until they have a pretty good roll. We also don't take them into situations where we'd need to swim very often
BUT they're an amazing toy to enjoy different kinds of river features and the sensations of being "wrapped in the river" is like nothing else in kayaking.