The fit is called 'Stretch Fit' https://www.amazon.com/Under-Armour-Printed-Blitzing-Stretch/dp/B018EL482M/ref=sr_1_2?ie=UTF8&qid=1481872415&sr=8-2&keywords=under+armour+baseball+hat+L%2FXL
There are various materials and designs available from Amazon and other sellers. Just search 'Stretch Fit Baseball Cap' and L/XL