These quick-drying pants proved tough as armor: In Arches National Park, butt-slides down rock slabs and knee-slamming falls produced no rips or scuffs, thanks to reinforcement patches in key abrasion zones. The nylon fabric repelled drizzle and dried within 15 minutes of a dunking, which kept one five year old comfortable through marshy alpine meadows and stream crossings. The pants are treated with permethrin, a bug repellent, but we still used DEET when mosquitoes were bad. Growth spurt? Elastic tabs built into the waistband customize fit.