Pillows. Serta Sertapedic Cool Coolgel Slumbergel Pillow. Set of 2. 300 Thread Count Standard Pillows. Sale. A Great Way to Sleep Better, and Get a Good Nights Rest. These Two Cool Gel White Pillows Are Machine Washable. Pillows. Serta Sertapedic Cool Coolgel Slumbergel Pillow. Set of 2. 300 Thread Count Standard Pillows. Sale. A Great Way to Sleep Better, and Get a Good Nights Rest. These Two Cool Gel White Pillows Are Machine Washable.