Patagonia built the Nano Puff® Vest for climbers who needed a weather-resistant, lightweight and packable synthetic insulation layer that could stay warm even when wet and withstand seasons of use. Ever since, those same features have made it the uncontested favorite midlayer for just about any outdoor pursuit. Style 84248 100% Recycled Fabrics - Lightweight 100% recycled polyester ripstop shell has a durable water repellent (DWR) finish made without intentionally added PFAS to shed light moisture I ncredible Warmth to Weight 100% Recycled Insulation - PrimaLoft® Gold Insulation Eco 100% postconsumer recycled polyester with P.U.R.E.™ (Produced Using Reduced Emissions) technology provides excellent warmth for its weight and stays warm when wet Signature Horizontal Quilting - Brick quilting pattern and horizontal quilted side panels with durable, abrasion-resistant thread stabilize insulation for greater durability as an outer layer and low-profile, low-bulk layering under shells Evolved Fit for Mobility and Comfort - Improved shoulder fit and elbow articulation offers better mobility; a slightly larger hood improves hood lift and is more comfortable at the chin Center-Front Zipper - Center-front zipper has a wicking interior storm flap and a zipper garage at the chin for next-to-skin comfort Pocket Features - Two zippered handwarmer pockets have cleanly finished zipper garages; an internal zippered chest pocket doubles as a stuffsack with a reinforced carabiner clip-in loop