I had them on outside in 90 degree heat for over an hour. They have not had a lot of use, but the sound quality & mic went from perfect to horrible overnight. After trying many adapters, I recommend this one, which also allows you to charge at the same time I get compliments every time I wear them & they can be worn while dressed up or down. Einfach wie eine Sandale anziehen und man hat genug halt in dem Clog. The battery life is pretty amazing. ;-) I would have returned however I bought this for a surprise bedroom makeover and had no time to do so. I love it and for anyone with dry, sensitive, and/or just fussy skin, try this. These are made of a hard rubber like material that doesnt have the wonderful soft cushioned feeling that the older ones do.