I don’t fuck under the covers usually, I couldn’t tell you! But I have spilt chocolate and coffee on them. They look and feel brand new still after a year of washing and machine drying. Seems safe with oxygen bleach.

They aren’t sweaty/hot to me. I sleep hot at the best of times, I think I would have noticed if they make it worse.

I’ve not had the need to air dry them, my guess is they’d be similar to cotton.