Pillows for shoulder stiffness, neck stiffness, side sleeping. Side sleeping pillows, high pillows, low pillows, high-resilience pillows, low-resilience pillows, pillows for straight neck, adjustable height pillows, soft pillows, washable pillows, sleep-well pillows, good-sleep pillows, chiropractic pillows, neck vertebrae stabilizing type, neck support, straight neck pillows. I purchased two on Rakuten. One is unopened. I tried the other one about twice with a cover on it. Please understand. ^_^