The Woolcloud Snapshirt is a natural-technical marvel. This is not a jacket but an insulated shirt that is meant to be worn close to your core. Filled with lightweight Duckworth Woolcloud insulation inside a shell of 40 denier Nylon. The traditional shirt styling lends itself to everyday wear around town with the secret high-performance ingredient of lightweight wool fill to keep you warm. The wool fill will not clump, or pack like down over time and is extremely breathable.