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Second, I vetted ratings to ensure each product received more than 80 percent five stars. ... For even more insights on that—including whether The North Face 550 or 700 might be better for you ...
The North Face is an American outdoor recreation products company. The North Face produces outdoor clothing, footwear , and related equipment. Founded in 1968 to supply climbers, [ 2 ] the company's logo [ 3 ] draws inspiration from Half Dome , a distinct rock formation rising over 8,700 feet (2,700 m) above sea level in Yosemite National Park ...
EN 13537 (or EN13537) is a European standard designed to standardize the temperature ratings on sleeping bags manufactured and/or sold in Europe. As of 1 January 2005 a CEN criterion came into effect covering the testing and publication of temperature ratings for sleeping bags. The new criterion differs from the standards that existed formerly.
Satisfaction with the thermal environment is important because thermal conditions are potentially life-threatening for humans if the core body temperature reaches conditions of hyperthermia, above 37.5–38.3 °C (99.5–100.9 °F), [11] [12] or hypothermia, below 35.0 °C (95.0 °F). [13]
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Fill power is a measure of the loft or "fluffiness" of a down product that is loosely related to the insulating value of the down. The higher the fill power, the more air a certain weight of the down can trap, and thus the more insulating ability the down will have.