Due to these pieces having a Durable Water Repellent application, they will absorb less odor, resist most stains and can be worn more/longer than typical apparel.  Thus, they can and should be washed less frequently.  Wash with like colors with mild detergent cold. Tumble dry low or lay flat. Do not use fabric softener during wash as this may damage the water repellency.  Please note that due to the stretch material of these pants, you may experience up to a half-size shrinkage after washing and drying in warm/hot water. This is temporary and they will return to their normal size after a wear. They can also be stretched back out by hand if needed.  Do Not bleach. Do Not dry clean. Iron on low heat ONLY.   Avoid oils and grease as they will permanently damage the water repellent treatment and possibly stain the piece. To remove oil stains use mild dish detergent like Dawn. Water Repellent Treatment- To reactivate treatment machine dry on medium heat or iron on low heat no steam.