Sterkowski Light Breathable Linen Summer Flat Cap Ivy League 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 Sweatband: cotton BUT IN BEIGE/BLACK AND BEIGE VERSIONS SWEATBAND IS LINEN No lining, cap has only 1 layer of linen cloth Made in Poland / EU