Rad River Cotton Five Panel Hat Sand Exclusive Billionaire Interviews, Strategies, and Mental Models. This hat is made of soft cotton and features a two tone look, adjustable velcro back, and fabric eyelets on the side panels. We want your Rad River Co. purchase to last! In order to preserve the quality, we recommend caring for your hats using these guidelines. 01. Grab a clean towel or soft bristled brush. A toothbrush works well. 02. Add a small amount of gentle soap and cold water to the towel or brush. Dish soap works well. Avoid hot water or soaps with bleach. 03. Gently scrub any stains or soiled areas. 04. Rinse quickly with cool water or wipe down with a wet, clean towel. Avoid fully submerging the hat unless it's waterproof. 05. Let air dry. Avoid drying in direct sunlight.