Officially licensed by the MLB A Product From '47 Material: 100% Cotton One Size Fits Most Closure: Adjustable Strap Fit: Unstructured The '47 Clean Up is a relaxed and curved, dad cap style made in a garment washed cotton that gives you a soft feel. Considered by many to be the best fitting hat in the game, perfect for all day and all night, you won't want to take it off.