Tomcat, you are right
but if they are the only PDFs you have on board and you wanted to take them off to go swimming to cool off
or to put sun screen on or for whatever reason, at the moment you take it off you are breaking the law....
I just thought people should know the facts......
I have a self inflating one and I find it hot and uncomfortable on hot humid days, so I do take it off and have the regular PDFs on board...