Durable materials that withstand anything from casual days to rigorous activity and a fit that's made for you—Columbia prides ourselves in providing just that and more for women's apparel. The Evolution Valley Pant is a prime example of comfortable, durable materials that give you the protection you need when you need it. These pants are crafted of stretchy polyester to provide full range of motion. Columbia's Evolution Valley Pant was designed for the active woman. The technologies featured in these pants provide ultimate protection. Our water resistant and breathable exterior resists the absorption of liquids to keep muddy and rainy environments from dampening outdoor fun, while the breathable construction keeps you cool and comfortable with its airflow capabilities; the combination of these two technologies ensures efficient and lasting protection from outdoor elements from the ground up. This pant also features two side pocket to keep you smaller items secure and zippered ankles for adjustable breathability. Columbia offers these women's active fit pants in a variety of sizes and inseams and multiple staple colors. To ensure the size you choose is just right, please refer to our sizing chart and abide by the following measurement instructions: To find your waist measurement, measure around your natural waistline. And for your inseam measurement, measure from the top of the interior leg to the bottom of the ankle.