REI Co-op Packable Sun Hat Women's with Braided Faux Leather Strap Size: One size fits most. Like new in excellent condition. Natural fibers ventilate warm air outward to keep your head from getting too hot Polyester elastic browband stretches for an easy fit, and it absorbs sweat to keep you cool and dry Hat is crushable, so you can pack it up for a trip knowing that when you take it from your bag it will unfold fresh to shape Faux leather chinstrap secures the REI Packable Sun hat when the winds pick up.