Just buy one.
Super cozy, tight enough to your face to stay up but not too tight as to be uncomfortable, plus, it doubles very well as a headband if you have long hair like I do. On top of all that it's cheap, I got it as an impulse purchase since I was already buying other things and it's easily my favorite thing from that order.
Mine came in excellent condition with the only sign of a previous owner being "PRVT PRYLE" written in sharpie on the inner tag, which personally is something I really enjoy seeing.