The Kelvin Aerolite Vest delivers maximum warmth with minimal bulk, even in the wettest, most extreme environments. It boasts an innovative synthetic insulation blend that replicates the low-bulk, highly compressible characteristics of down, but with warm-when-wet performance. Count on it to keep you going when temps suddenly plummet and disappear into your pack when not needed. Product ID: 50258 Features: Synthetic PrimaLoftA(R) Gold insulation with Cross Core(TM) technology replicates the warmth and compressibility of down, but with the benefit of warm-when-wet performance Lightweight insulation is infused with silica aerogel, a nearly weightless material that&&';;s composed of more than 95% air and acts as additional thermal insulation Exterior fabric constructed of a 27-denier polyester face with durable water repellent finish and a 27-denier polyester backer DWR finish resists precipitation and prevents face fabric from wetting out Deep, zippered chest pocket safely stores your valuables Imported