The ones I've heard of are bamboo, linen, microfiber and tencil, all claiming to be cooler and breathe better than cotton. I've only ever had cotton sheets so I don't know which to try, but I definitely want to try something!

I think I'm most intrigued by bamboo but I have no idea what fabric made from bamboo would even feel like.

Linen claims to be wonderful and to soften with each wash, but linen clothes can be scratchy and stiff so it's hard to imagine sleeping in it. Plus, they wouldn't have to claim getting softer with each wash if they started out soft to begin with. How many washes before they start to feel good?

My DH brought home microfiber from Costco but nope to that...the fabric was thick and I couldn't imagine them being cool. A common comment in reviews was that they were so soft but quite warm. They've been returned.

If you have "cool" sheets you like, LMK!! Thanks!