To keep weight and price down, the fabric here is recycled, lightweight wool woven with reclaimed synthetic fibers (mostly polyester). This initially gave me doubts, as one of wool's selling points is that it doesn't melt when sparks fly--unlike synthetics such as fleece. So, I lit up some spruce and turned my arm like a rabbit on a spit. The fabric sizzled and eventually flared up, but then, pure wool will catch fire, too, after a while. So far, so good. A week of spring gobbler hunting proved the clothing's versatility in 40-degree shifts in temperature.