“My knees have been increasingly giving me gyp over the last few years, and after fitting several radiators a few weeks ago they were in absolute agony; I was walking around like Douglas Bader. "Must replace my knee pads, methinks!". The old ones weren't even a couple of years old, and although a decent brand, the foam's 'memory' was obviously knackered, as always happens. Looking for replacements, I come across these whilst Googling and although they're a little pricey compared with foam, I thought "Yeah, why not: because you're worth it!" What a revelation! Quality is very good, though they look odd to say the least, a bit like those rubber-web doormats you can get, and they're about twice as heavy as foam, but boy do they work! Even with the best foam pads, your knees can only take a few hours of abuse, but with these babies I can kneel all day in comfort, as they spread weight well and it doesn't feel like there are any pressure points. The other great thing is that unlike foam, you can leave them in your work trousers when you sling them in the washer, and the geodesic rubber construction means they let air through and the material dries quickly (for the same reason, this feature is also a boon when you've knelt in water whilst working). The manufacturer claims they will last for many, many, years without loss of efficiency, so they'll pay for themselves in the long run.
You're only given one pair of knees, so spoil 'em! Get a pair!”