The T shirt feels great to the touch with a slight synthetic feel rather than cotton but this isn't a criticism as it feels soft and there' no static cling. It's supposed to be breathable so on a very hot evening i wore it without a base layer and hit the trails.
Simply put, it was great and as described, it felt cool and wasn't too flappy and didn't get wet and sweaty the whole 17 mile ride and I was working hard pedalling the one speed bike. for £17 you couldn't really ask for more. It also has some antibacterial properties which means it didn't stink the next day like a cotton T shirt would. I'm impressed