The three ratings – Warm, Warmer and Warmest – give you a quick look at each coat or jacket's comparative warmth. The high and low temperatures (Fahrenheit) associated with each rating represent a comfort range you can expect the garment to perform well in. All our ratings are based on wearing typical cool weather clothing, including a cotton turtleneck, wool sweater and jeans.
TIM has copper skin and is equipped with heaters and sensors for measuring temperature. He is placed in a chamber wearing our outerwear over everyday clothing (like a shirt, sweater and jeans). Testers deliver electrical power to the wires in his copper "skin" to maintain a temperature of 35?C (about the temperature of your skin). Then they measure the power required to keep that "body temperature" constant as the chamber temperature is lowered. Using the results of the test and a complicated formula, we arrive at the outdoor temperature range in which someone can expect to comfortably wear the tested jacket, parka or coat. We temperature-test each style to make sure every coat or jacket we sell will stand up to the real world conditions you'll encounter.