Sterkowski Light Breathable Linen Summer 5 Panel Flat Cap To measure your head size get a soft tape measure. Measure around your head above your ears and eyebrows where your hat would normally sit. If your head size falls between two sizes, we recommend that you choose the larger size of the two. If you like loose fit, then please adjust the soft measuring tape in a loose way. 100% linen cloth Details: very breathable and lightweight, visor fastened with press stud (snap fastener) No lining, cap has only 1 layer of linen cloth Made in Poland / EU