niceEshop(TM) Royal Blue Ultraviolet,Proof Folding Umbrella Hat With Adjustable Headband Material:Polyester,Plastic ,Metal,Nylon,Fit Head Girth:55cm/21.7inches Advantage:Adjustable headband is suitable; Also features a nylon strap for fixing Function:protect you from Rain or Sun,for children or adult use; Keep both hands free while protecting your head Direction:Just unfold the Umbrella Hat and push the white short pillar to the top,then put on it