The lightest down layer in our long history, this instant warm-up is the ideal down weight for layering or packing. The adaptable design features a layerable and athletic cut that allows the critical insulator to function expertly as a mid, last or emergency layer. 800 fill power premium European goose down traps core heat, while a water-repellent shell sheds precipitation. Stretch panels add mobility when reaching, twisting or turning, while a StormRepel® DWR sheds light precip and light snow from the surface. "Every time I wear this shirt, someone asks me where I got it. It looks great AND performs well. This shirt is comfy, warm and slim enough to wear all year round." -Melissa Arnot