For cold-weather excursions and colder-weather layering the Mountain Hardwear Kor Strata Jacket is the lightweight warm layer that will keep you comfortable. PrimaLoft Gold Active traps in heat without sealing out airflow so you can stay warm throughout your activity without overheating. Constructed with nylon ripstop this jacket withstands harsh textures and is built with mechanical stretch to keep you moving freely. Gusseted underarms help reduce the hem riding up when you reach for something promoting continuous coverage throughout your activity. The slim fit is easy to layer and reduces bunching to stay out of your way as you move.