MALOUF Z AERATION Buckwheat Alternative Pillow with Removable Rayon from Bamboo Velour Cover - 3-Year Warranty Filled with air cushioning polyethylene tubes that promote continuous air flow Outer cover features soft rayon from bamboo velour on one side and stretchable spandex on the other Correctly aligns spine by supporting the natural curves of your head, neck and shoulders Two-sided cover offers softness on the upper side and flexibility on the lower side for comfort and conformation 3-year warranty