The Aeros Down Pillow combines the softness and supportiveness of the Aeros pillow series with a luxurious down pillow top. Technical fabrics from the Spark/Flame sleeping bags keep the weight down and the packed size almost impossibly small. And, as you drift off to sleep, your pillow won’t be sliding off your mat, thanks to the Pillow Lock system which keeps your pillow right where it belongs. Did you know? With the integrated pumps of the pack sacks of our ultralight air sleeping mats you can easily inflate your pillows. Simply turn the bag inside out and use the smaller side of the multi-function valve.