The Backcountry Tegraltex bivy features a top fabric that rolls down for warm evenings.
The bivy is named for John Salathe, who started climbing at the age of 45. Two years later, Salathe and Anton Nelson pioneered Yosemite-style climbing by doing the first base-to-summit ascent of the Lost Arrow Spire, with four nights of bivys.
The bivy's Tegraltex trilaminate fabric is waterproof and wind-resistant.
Explaining Tegraltex Fabric
Tegraltex is Integral's own trilaminate fabric, which consists of a microporous PTFE membrane that's laminated to an outside layer of 1.6-ounce ripstop nylon (treated with Teflon DWR water repellent) and an inner layer of non-woven Nexus. The result is a three-ply material that is highly vapor permeable, waterproof, and wind-resistance. The key to the performance of Tegraltex is the middle layer of tetratex PTFE membrane, which is made with Teflon. The micropores in the membrane allow water vapor (perspiration) to pass through and out of the fabric at a rate of up to 1 liter per square yard every 24 hours. The same microporous structure acts as a barrier to droplets of rainwater, which are too large to penetrate the pores of the Tetratex PTFE membrane. The end result is a fabric that--according to Integrated Design's research--is more durable and vapor permeable than any equivalent polyurethane trilaminate.
- Length: 92 inches
- Height range: Up to 6 feet 6 inches
- Width: 32 inches at shoulders, tapering to 22 inches at feet
- Girth: 70 inches at shoulders, tapering to 52 inches at feet
- Packed size: 15 by 5 inches
- Colors: Blue/yellow combination, olive
- Weight: 2.1 pounds
- Warranty: Lifetime
A privately owned company that started business in 1984, Integrated Designs manufacturers five complementary product lines: tents, bivy shelters, sleeping backs, backpacking accessories, and clothing. All Integral Designs products are suitable for multi-day outdoor trips, and have been tested in extreme conditions on mountaineering expeditions. The company emphasizes function and long-term durability, and has developed and refined the product line following extended use in the outdoors. Integrated Designs also seeks out the best materials available and subjects them to thorough lab and field tests. Located in Calgary, Alberta, in the shadow of the Canadian Rockies, the company can easily manufacture a produce on one day and test it in the mountains the day after.