Per walls.com: Introducing the Driftwood Mid-Weight Puffer Vest – designed for the rises and drops in temperature. The exterior of the Driftwood Vest is made with 110 GSM, 3.8 oz breathable matte nylon with DWR, and a Primaloft insulated interior. Primaloft is a synthetic fiber technology solution that is thermoregulating, warm when wet, breathable, lightweight, and made with 100% PCR (Post Consumer Recycled) bottle chips. It can also be worn as a mid-layer between items like the Crosscut2 shirt and the Pinewood jacket, and is a partner to the Driftwood Mid-weight Puffer Jacket. This tough little vest is capable of taking whatever nature throws at it. Rib Knit Collar Full Range of Motion Zipper Closure with Interior Storm Flap Adjustable Drawcord Hem Secure Chest Pockets Vertical Quilting Channeling Reflective Accents Durable Water Repellent Primaloft® 110 GSM. 100% Nylon with DWR 1.7 oz. 100% Recycled Polyester Taffeta with Primaloft Insulation.