Having tried all other materials I always come back to these. I don't like that they are plastic, but wool, cotton, and tencel are too thick for my taste. If I would find a pair of silk ones with the same cut I might try them, but have not stumlbled upon such yet.
Fabric: 47% recycled polyester, 42% polyester, 11% elastane body and 90% polyamide, 10% elastane waist.