Sterkowski Genuine Leather Aviator Trapper Cap with Mask and Collar 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. Cap style: Aviator / Bomber (!) We make this hats to order in Poland / Central Europe. They are also shipped from here. Please keep in mind the handling and shipping time. Shipping time can be shortened by choosing expedited shipping (Fedex), but it does not impact handling time - we need it to prepare your cap. Should you have any questions or would like to estimate delivery date for your order - please contact us via Amazon contact form. Thank you. Natural leather ; Polar fleece lining ; Lowered visor