How Does It Fit Adjustable Fit Take Care of Your Shit Wash the cap with the rest of similarly colored clothing in cool water. Do not use bleach. If you are very concerned with protecting the shape of the cap, you can use a specially designed hat form and toss it in the washer. Allow the cap to dry in the form or over a coffee can or other head-shaped container. Do not put baseball caps in the dryer. Get the Specs 100% cotton twill. Unstructured low profile 6-panel. Adjustable Cloth Hideaway Backstrap.