The Patagonia Baby Reversible Tribbles Pants provide two-for-one fully insulated convenience for young sprouts: The 100% recycled polyester shell side is durable and wind sheltering, and has a Deluge(R) DWR (durable water repellent) finish that sheds moisture. The thick 100% polyester deep-pile double-faced fleece side feels great against the skin. (Reverse them if the mood shifts, or to slide easily over layers.) Between the two resides cold-buffering 60-g Thermogreen(R) 100% polyester (90% recycled) insulation. With an easy-on elasticized waist, and spandex binding at the ankles to seal out chill.