Our premium warm-weather synthetic bag, REI Aura 40 offers low weight, quality materials and dependable performance in wet conditions. Its great for backpackers and ultralight adventurers alike. REI-exclusive PrimaLoft MXL insulation blends large-diameter and small-diameter fibers for the perfect combination of loft, compressibility and heat retention. PrimaLoft MXL fibers are siliconized for even more water resistance than other synthetic insulations. REI Aura features a durable ripstop polyester shell and lining. In-the-round design wraps vertical baffles around the perimeter, allowing the insulation to remain fully lofted and keeping it from shifting and migrating. Contoured hood, face muffler, roomy foot box and full-length draft tube with ground-level seams help keep body heat in and cold air out. External chest pocket keeps essentials such as your headlamp, watch and glasses right at hand and easy to find in the dark. Differentiated drawcords 1 round, 1 flat let you adjust hood and neck easily in the dark. Pad loops provide attachment points to keep your sleeping bag and pad together, so you neednt worry about rolling off onto the cold ground straps sold separately. European Norm EN is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags. Comes with stuff sack and large cotton storage bag.