Altrec.com:

If you stop and think about it, a dependable climbing jacket is as essential as a reliable mountaineering rope. A four-season mountaineering shelter can save you from the elements and a -40F rated sleeping bag can provide adequate warmth, but it's your jacket that's going to protect and insulate you all the way back to civilization, which is why this 650-fill down Sub Zero SL Hooded Jacket is such an essential fit for expeditions and extended climbs. It offers waterproof/breathable performance in the form of a special Conduit SL laminate that facilitates vapor transfer without sacrificing body heat. You'll find reinforcement fabric along all key abrasion areas of the garment and plenty of internal and external pockets for gear.

BackCountry.com:

The Mountain Hardwear Mens Sub Zero SL Hooded Jacket surrounds you with 650-fill down for the coldest possible conditions this winter. Mountain Hardwears most popular down jacket, the Sub Zero SL is cloaked in Conduit SLthe companys proprietary water resistant, breathable fabric, allowing you to wear the Sub Zero SL skiing in drier climates and cruising around town while those fat flakes pile up. The seams in the baffles are not sewn-through, much like a high-quality sleeping bag. This means there is no true separation of the insulation at the seams, so you stay warmer and more comfortable, without the cold spots common in sewn-through down garments. The hood is detachable, and the fleece-lined collar and hand pockets keep you extra comfortable. An interior mesh water-bottle pocket is super handy for backcountry excursions, and of course, Mountain Hardwears quality is legendarythere are few companies that match their excellence.