Women's baseball cap: The Under Armour ISO-CHILL LAUNCH WRAPBACK has a hole in the back for wearing your hair in a ponytail or bun. The back is made of elastic fabric with a snap fastening for a comfortable and secure fit. The Iso-Chill technology dissipates body heat and is cool to the touch. The low-profile Velcro closure prevents hair from getting caught, with an elastic layer underneath for added flexibility.