I tumble mine on occassion especially if I can't wait for them to air dry cos I'm a day or 2 late doing the nappy wash if ykwim....

Haven't had any probs with waterproofing or leaks because of it at all... I know it does reduce their lifespan a bit but I haven't noticed any probs so far

hth

Has anyone placed their kooshies in the dryer with no problems, i've not had any leaks from them and usually dry on line but as the weather is a little crappy at mo i'm doing it indoors and they are taking a little too long. It says they can be tumble dried but don't want to loosen the absorbancy on the outside.