Here's what other sites are saying:
When you need an ultralight belay top for anything from rock to ice climbing or a mid-layer to wear beneath your technical shell, use the Norrona Men's Lyngen PrimaLoft 60 Insulated Jacket. Lightweight, compressible PrimaLoft insulation comes to the rescue when temps drop and you have to stand still while your partner figures out a difficult ice maneuver. Plus, the Lyngen stuffs easily into its own pockets when it's not needed.
- Backcountry.com refers to the men's version