RDR El Cuernos Hat - All ColoursThe RDR Champion Hat has the following features: 4X Wool Felt 4 3 4 Brim 4 3 4 Crown Quality leather headband Multiple Colours Available How to measure your hat size: Use a tape measure (or a length of string that you will have to hold up to a tape measure) to determine the length. Place the string or tape around your head about 1 8 (4mm) above your ear, across the mid forehead, completely circling your head. Hold the tape firmly, but not too tightly.