Mountain Hardwear ‘Zoned’ Sleeping Bag — We have extensively tested Mountain Hardwear’s Lamina sleeping bag line over the years (and we’re huge fans). The to-be-released Hyperlamina Spark, a 35-degree bag, is an upgrade in the line that’s touted to be the “highest performance synthetic bag on the market.”
Mountain Hardwear backs this up with a design that includes synthetic insulation that is “thermally mapped” to minimize bulk and weight (but maximize warmth). Weight is 1lb 10oz. The proprietary Thermal.Q insulation is piled thicker in the foot box and other crucial areas.