you can/must wash your jackets. do not use a liquid detergent with phosphates or added perfumes and most definately DO NOT use fabric softner. a powder detergent, nikwax, or any detergent designed for waterproof clothing on a cold cycle works well. also, contrary to popular belief, you should tumble dry on low for about 30 minutes. the dryer restores the properties of the dwr finish making it waterproof once again.