Superlight PrimaLoft® One synthetic fill provides the Mountain Hardwear Hooded Compressor Jacket with an excellent warmth-to-weight ratio. A great jacket on its own or as a layering piece, the jacket compresses easily and insulates the user when it is wet. The Compressor was specifically designed for backcountry activities where moisture and weight are factors. This piece is often used as an outer layer for belay work but also excels for superlight backcountry use and mountain or winter camp sites.