The Bedgear M1X Performance Pillows® provide a personalized sleep surface. The M1X Pillows offer four various profiles/sizes (in a series of 4) to complete a sleep system that is perfectly fit to you. Offering support which is more firm compared to the M1, the M1X Pillow features Dri-Tec® fabric. A channel weave complete with a sleep system surface, it allows you stay cool and dry through the night, as it wicks moisture away from the body. Consisting of their Air-X® ventilated side panels and 3D mesh fabric (which is patented), the pillow design allows the air to flow out/away, sustaining ambient temperature. At the same time, it prevents entry to allergens and dander at the core of the pillow. Finally, the Boost® fill ensures pressure relief that will not bottom out on you. Both soft and breathable, it creates a supreme pillow for support. Plus, having an exceptional ability to conform, it suits your needs with the added bonus of being hypoallergenic. The M1X Pillows are made in the USA of US and imported materials. They should be spot cleaned only to keep them clean. Please note, there are no returns once the package has been opened for pillows.