Yeah, they're a little too hot. I like taking them off from time to time during break so I can let the knees on my pants dry out. (I have an overheating problem.)
Actually the good floorlayer knee pads are something like $200, rebuildable, and they strap on in a way that doesn't scrape the backs of your legs raw.
All in all it's not too bad, and much worth saving a trip to the ER! Stay SAFE!