Aeros Down PillowThe 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 of your mat: the Pillow Lock system keeps your pillow right where it belongs.