A bivouac sack for the twenty-first century, it’s 100% seam taped for waterproofness and durability, weighs in at under a pound, and compresses like magic into any pack. High-tech Marmot MemBrain® fabric breathes easily while blocking wind and water: The Alpinist Bivy offers awesome minimalist protection for climbers and backcountry adventurers who must travel light.
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MemBrain Strata is Marmot's own lightweight waterproof/breathable technology: a lamination technology that rates a whopping 20,000mm in waterproof performance and 20,000 gr in breathability.
Requiring neither lining nor 3-layer construction, MemBrain Strata products are by far the lightest, most breathable garments in their categories.
Marmot's proprietary 2.5 layer MemBrain Strata uses micro non-organic particles on the inside of the lamination to increase durability and provide a dry touch instead of that clammy feeling you get from some other products.
The back print pattern is carefully designed to achieve the maximum durability and breathability. Abrasion tests rate 4-5 times better than regular laminates, which is why 2-layer laminates require a separate lining.
MemBrain Strata creates a soft, quiet and compressible fabric while its abrasion resistant design achieves maximum durability.
Compared to other 2.5 layer coatings in the market, our lamination is almost 100% more breathable. In addition, our laminated fabric stretches more than coated fabrics.
Waterproofness: 40 PSI 20,000mm Water Repellency: spray test 80/20 Breathability: hohenstein ret: 2.5 layer -- 6-6.5 (JIGS - 1099 B1: 2 layer->20,000 gm/24hrs)
Why do we encourage proper care of our clothing and gear?
Because you have invested in (or are thinking about investing in) one of the most technically advanced pieces of apparel or equipment you'll ever own and we want to make sure you have the information you need to protect and care for your purchase. Proper care assures you will optimize the performance of your Marmot product and maximize its service-life.