These are an 80% polyester and 20% elastane casual outdoor pant. They have a pull-on soft yoga waistband, front and back pockets, and a jogger fit. I used them both casually and for hiking/backpacking and found them SUPER comfortable. ***Note: I had these professionally tailored to make the waist fit tighter. I have a curvy body and wore these as a higher waist style. Want to make anyone accustomed to a typical Patagonia fit (straight through the hips and thigh) aware that this has been modified. However, if you are curvy and are looking for a snug waist, these are for you!***