"What Our Gearhead® Experts Are Saying:""I wore the GOREWEAR R5 GTX Infinium Insulated Jacket on a brutally windy early spring morning where the temperature felt about ten degrees colder than it actually was, and the WINDSTOPPER fabric completely shut that out. The POLARTEC ALPHA insulation kept me warm during the first miles and then breathed well enough that I never had to stop to take it off once I hit a harder effort.""There is a specific kind of running day that this jacket was made for. The kind where the temperature is low, the wind has an edge to it, and layering up feels necessary but you know a heavy jacket will cost you once the effort climbs. The GOREWEAR R5 GTX Infinium Insulated Jacket threads that needle precisely, delivering windproof, water-resistant protection at a weight of just 8. 8 oz so it never becomes a burden on the move. GOREWEAR built this jacket around WINDSTOPPER fabric by GORE-TEX LABS, which is totally windproof and reliably breathable in a semi-transparent nylon construction that keeps the weight minimal without sacrificing coverage. POLARTEC ALPHA insulation handles warmth across the body with stretch panels at the hem and cuffs that move naturally with your stride and prevent cold air from sneaking in at the edges. A close-fitting hood tucks in without bulk, and the adjustable drawcord hem lets you dial the fit to conditions. The details here are considered. Highly reflective color-tone tape and logo hit hard when light strikes them, covering low-light visibility without disrupting the clean aesthetic during the day. Two side zip pockets plus a zip pocket with a small inner pocket handle storage and organization, and the zip port keeps your audio gear routed and tangle-free. This is a jacket built to disappear into your run and show up only when the weather asks it to."