Inner Linning is 100% Polyester satin lining, with an inner trim band for extra comfort. Interlining is 100% Thermoplastic Polyurethane membrane, making this garment breathable and waterproof. The membrane lets out body perspiration to the outer surface, while remaining waterproof and protecting against the worst weather conditions. Outer jacket (shell) is made from 60% wool, 25% polyester, 11% acrylic and 4% composed of other firbres, 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.