One size fits most, mesh trucker style, 60% cotton, 40% polyester.
There's this saying: "If you see a woman adjusting her ponytail between sets, then you know that shit is about to go down!" Or maybe ponytails are just really annoying and always coming undone during tough workouts? I don't know, I'm a bald dude. But I once spoke to a woman (no, really) and she told me that these caps rock. They have a nifty slot in the back for ponytails and messy buns. Perfect for that 5AM gym sesh.
– Chris Shugart