YUP, they do work. If rain is threatening I carry one with me. I don't know how many years I've had one of these things. I still have my original one that was a different brand but I suspect the same patent now under a new name. I lost the bottom part of it but it still works. I bought a new one this year because they're a little bigger now and keep you dryer. My old one if you sat your knees got wet.