Using these San Diego Classic Caps is super easy. Just place the cap on your head and adjust the strap at the back for a comfortable fit. When wearing, keep in mind the California Proposition 65 warning about the chemicals in the cap. For maintenance, you can spot - clean the cap with a mild detergent and a soft cloth. Don't machine - wash or dry it in a dryer as it may damage the cap's shape and color. Also, store the caps in a cool, dry place when not in use to keep them in good condition.