These shirts are 100% medium weight cotton. Super comfortable and a great addition to your pirate garb! The shirts are of an Asian design - worn for centuries. The clasps are the 'frog button' style - the front is closed by using fabric ties over fabric knots, unique! Amazing Quality at an unbeatable price....Only at Zootzu! - Great for pirates! - Wear it over another shirt - looks amazing and has pockets! Check your measurements. See size chart. We recommend choosing your normal t-shirt size or above.