Our Denali guides notes that their sleeping bags with event shells tended to dry out more quickly on sunny days than other bags on the expedition. Also, the bags were less prone to condensation freezing to the inside and outside of the bag. Our guides in the Cascades appreciated the lightweight and high wind and water-blocking properties of the fabric on windy and wet summit days on Mount Baker.

How the tests were conducted

Field tests for all Guides Choice products are conducted by a core group of professional guides within the staff of the American Alpine Institute. They guide and climb in the world's major ranges year round.

Evaluations are made throughout the year in desert, cold weather, rain, snow, high wind, and high altitude environments. Multiple testers in a variety of climates and mountain environments test each product. Each product is tested by multiple testers in a variety of climates and mountain environments. Test lengths range from four to twelve months and average seven months. The constant and demanding use to which the gear is put by AAI guides corresponds to four to ten years of use that a recreational climber would give it. More information.

In the specific case of event, tests were conducted using a variety of products (including jackets, sleeping bags, and boots) that use the fabric as a principle component. Tests were conducted in the Washington Cascades, the California Sierra, the Alaska Range, the Andes of Ecuador, Bolivia's Cordillera Real, the French and Swiss Alps, and on Denali.