Sea to Summit Aeros Premium Pillow - Green Brushed 50D polyester knit is very soft and durable Synthetic fill between pillow case and TPU bladder increases comfort and wicks away perspiration Curved internal baffles create contours that cradle your head Scalloped bottom edge centers pillow around your shoulders whether you are sleeping on your back, side or upright in a chair Inflate pillow in just a couple of breaths with the multi-functional valve