Burton AK BK Insulator Jacket - Men's - X-Large - Black - Burton AK BK Insulator Jacket - Men's. From street piece to life-saving extra layer, this is the pro pick for powerful, ultra-packable down warmth. If you Are one who is always cold, refUses to hide indoors, or spends a lot of time in the backcountry, then the [ak] BK Down Insulator Jacket isn't nice to have, it's a necessity. Ultra lightweight and extra-packable, the BK's weather-repellent ripstop fabric encapsulates ultra-premium 550 down for breathable, radiant heat. Venting Pit Zips; give all that heat a quick escape, while the chest pocket is perfect for your wallet, keys, and phone. Ride this jacket under your shell or stuff it in your pack for a quick warm-up at the summit; whatever you do, just make sure you bring it. Key Features of the Burton AK BK Insulator Jacket: Lightweight 20D Ripstop DWR Coated Fabric [600MM] 90/10 Ultra-Premium 550 Down Fill [ak] Fit with Engineered Articulation Pit Zips; Fleece-Lined Handwarmer Pockets Zippered Chest Pocket This product can only be shipped within the United States. Please don't hate us.