Compact and superlight, the Atom Sl Vest Women's from Arc'teryx easily stashes in your pack, ready to grab when summer temperatures drop. Worn as a midlayer or standalone, it delivers moderate insulation perfect for early morning runs and taking in the view from a freshly bagged peak. The Tyono™ 20 shell balances breathability and wind resistance, and the Coreloft™ insulation is light, compressible, and efficient. Lightweight stretch fleece side panels improve ventilation and hold the fit.\n\nMaterialsCoreloft™ Compact 40 insulation (40 g/m²). Highly crimped, multi-denier siliconized polyester yarn that has undergone a special process which reduces the thickness of the material by 50%, without reducing its insulation value by the same amount. Lightweight, breathable, thermally efficient 100% polyester fibre.Dope Permair™ 20 - 100% nylon liningPermair™ 20, 100% nylon lining bluesign® Approved Stretch Fleece Side Panel - 93% Polyester, 7% ElastaneTyono™ 20, 100% nylon Arc'teryx Atom SL Vest Women's Lumina | Buy Arc'teryx Atom SL Vest Women's Lumina here | Outnorth