A breathable, low-bulk fleece layer built for cool-weather movement. - Technical R1 Air fleece: 100% recycled polyester jacquard with hollow-core yarns for lightweight warmth, breathability and quick drying - Easy temperature control: half zipper opens quickly for ventilation - Layer-friendly shape: slim fit and a low-bulk stand collar sit cleanly beneath an outer shell - Useful storage: one zippered left-chest pocket plus two low-profile front zip pockets - Pack-ready construction: offset shoulder seams reduce interference beneath backpack straps Fit note: Patagonia classifies the R1 Air Fleece as slim fit, intended to layer over a base layer or light midlayer. Please compare the tagged size with a Patagonia size chart or a similar garment that fits you well. The actual item and attached tags are shown in the listing photos.