Our Take 

The perfect sleeping bag for a Camp Muir Rainier climb, the Lamina™ 15 is ideal for early and late season mountaineering when temps won't be too extreme. Unique Lamina™ construction maximizes the loft of your insulation; eliminates cold spots; and thermally maps insulation to areas you need the most warmth. By strategically placing insulation, we are able to concentrate warmth where you need it.