The 9Forty is a structured, adjustable replica of the MLB® on-field cap with an embroidered Seattle Mariners team logo on the front panel and stitched New Era® flag at wearer's left side. The six panel construction features breathable eyelets with a curved visor and button at top. Open back has an adjustable Velcro strap featuring the team name.Hat Details:- Made of 100% polyester- New Era flag on the left side- Velcro strap back featuring the team name Hat Sizing Info:Adjustable - velcro back allows most sizes to fits comfortably. Can fit 53cm to 61cm comfortably. That includes kids 10 and up as well as XL size adult heads.