Aeros Pillow Cases slip over your Aeros Ultralight or Premium pillows and are easily removed to be machine or hand washed. They also make pre-2019 Aeros Pillows PillowLock compatible for use with Sea to Summit sleeping mats. And if you find yourself on a fast-and-light mission, they can be stuffed with a down jacket or other clothes to form a minimalist pillow. Features Hidden 8” / 20cm zipper means quick and easy removal for machine washing Makes a pre-2019 Aeros PillowLock compatible Soft polyester fabric for comfort