Norrona Lyngen CLO100 Jacket
Here's what other sites are saying:
Norrna designed the Mens Lyngen CLO 100 Insulated Jacket as an ultralight belay top for anything from rock to ice climbing. It weighs next to nothing and insulates well. You can stuff this Norrna jacket in its own pocket when its not needed, and the PrimaLoft One insulation comes to the rescue when temps drop and you have to stand still while your partner does battle above.