The most versatile all around synthetic insulated hoody from Arc'teryx. A top pick for our Seattle Mountaineering Store for use underneath your rain shell in extreme wet weather when some customers will prefer a synthetic insulation layer. Synthetic Coreloft™ insulation still retains the majority of it's insulation value when wet. This low-profile jacket is very lightweight and is designed to be worn as either a midlayer underneath a rain shell or as your outer layer. Stretch fleece side panels increase breathability and provide a more low-profile fit when worn as a mid-layer underneath your outer storm shell. Details Tyono™ 20 Denier Outer Fabric with DWR Treatment, 100% Nylon Outer Fabric is Light, Soft, and Air Permeable Coreloft™ Compact 60 100% Siliconized Polyester Insulation Performance Stretch Fleece Side Panels for Increased Breathability Helmet Compatible Insulated Stormhood™ with Structured Mini Hood Brim Adjustable Hood Drawcord with Single Pull Adjuster No Slip Zip™ Full Length Front Zipper Two Zippered Hand Warmer Pockets Internal Zippered Chest Pocket Stretch-Knit Cuffs Articulated Elbows Gusseted Underarms Adjustable Drop Back Laminated Hem with Dual Adjusters Wind and Moisture Resistant Breathable Insulated Very Compressible Extremely Lightweight 11.3 oz (320 g)