Okay, so its official name is the Nano-Air® Light Hybrid Jacket. But around here we call it the “Midlayer Mullet”—protection up front, breathability in the back. Created to put an end to the clam factor that often accompanies hefty aerobic effort in chilly temperatures, the Nano-Air® Light Hybrid Jacket will keep you at optimum operating temperature even on bad hair days. A light layer of warm, stretchy and breathable FullRange® insulation (40-g) is wrapped in a lightweight yet durable, 100% nylon ripstop shell with DWR (durable water repellent) finish for just the right amount of wind- and weather protection up front. Everywhere else, a super stretchy, airy waffle knit swiftly wicks moisture, controls odor and dissipates heat. Other details include a sleek center-front zipper with a zipper garage that’s easy on the chin, stretch-knit cuffs with thumb holes to ensure critical coverage, low-profile zippered pockets for comfort under a harness or pack and a stretch binding hem to seal in warmth.