Inner Lining is 100% Polyester lining, with an inner trim band for extra comfort. Outer jacket (shell) is made from 60% wool, 25% polyester, 11% acrylic and 4% composed of other fibres, making this cap of top-quality fabric. Produced to the highest standards by a manufacturer of top quality countrywear and derby clothing. The tweed has been treated with teflon, which acts as a fabric protector, making this product long lasting-lasting protection against oil- and water-based stains, dust and dry soil. Please check our size guide against your cap you wish to purchase.