Arc'teryx Atom LT Pant
Source: bought it new
Price Paid: $190
Every bit as good as the jacket, packs down even smaller.
Enough has been said about the Atom LT Jacket and as soon as I became acquainted with how amazing it is, I picked up the pants. The combo went with me on a 4-night survival training course recently (Haley Strategic Partners Summer Mountain Problem Solver).
We all slept in pine-bough shelters down to 45 degree rain so pretty much everybody was cold . . . except me. I don't think my shelter was so far superior to everyone else's, I think it was the Atom LT jacket and pants that I wore under my rain gear as I slept. Wearing the combo is truly like having a sleeping bag and you barely notice them in your pack at all.
The pants have full zippers and cinch up tight at the ankles. they have a small pocket in the waistband which works well as a stuff sack. This combo is unbeatable for lightweight, packable warmth.
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Here's what other sites are saying:
The Arc'teryx Atom LT Pant is designed to keep you warm on the coldest days, or as an extra outer layer when belaying or during low activity moments in the mountains.
The Arc'teryx Atom LT Pant is a lightweight, synthetic, insulated pant. Moisture-resistant outer face fabric Breathable Insulated Lightweight Compressible and packable Wind resistant
The Arc'teryx Atom LT pants are insulated and weather-resistant, making them ideal as an outer layer to preserve warmth during down time on your alpine adventures. Coreloft 60(TM) insulation delivers lightweight warmth during cold conditions. Breathable, stretch fabric has a Durable Water Repellent finish that helps bead up water on the surface; wind resistant. Articulated knees and seat aid comfort and movement. Full-length separating side zippers; bottom snap closure on zipper. Arc'teryx Atom LT pants are lightweight, compressible and packable. Elasticized waist; adjustable cuffs; internal stow pocket with attachment point.
You don't mess around when it comes to proper layering in the bitter cold, which is why the Arc'teryx Atom LT Insulated Pants fit the bill for your next sub-zero adventure. Extremely light and packable, these pants feature Coreloft insulation to trap your body heat without bogging you down with excess bulk.