I would have thought these were a gimmick until we moved to a house with no carpet Poor little DS (8mo) has just started to crawl and his knees are quite red and sore already so I wondered about getting him some kneepads. Has anybody used these and what are they like? Do they impede them crawling naturally? Do they irritate the back of their knees? It wouldn't be a problem in the winter as I'd have just put thick fleecey trousers on him but with the summer coming up and him wearing shorts [ouch] I tried crawling on our kitchen floor - we have porcelain tiles which are 10 x harder than regular tiles - and it was agony!