Effectively balancing comfort, weight, and packed size, the Sea to Summit Aeros Down Pillow incorporates a plush cushioned top, ergonomic features, and a travel-friendly inflatable design. The pillow s ultra-lightweight 10D down cushion top provides excellent warmth and next-to-skin comfort. Differentially-cut horizontal baffles reduce insulation migration so you get consistent support and warmth. The base of the pillow case is made from lightweight but durable 20D fabric. Inside, a lightweight and high-strength thermoplastic polyurethane inflatable core provides excellent support for your head and neck. Thanks to an efficient multi-functional valve, inflation and deflation are quick and easy. The Sea to Summit Aeros Down Pillow is available in your choice of colors and Regular (13.4 x 9.4 x 4.7) and Large (16.5 x 11 x 4.7) size options. A custom-fit stuff sack is included with each pillow.