Hydro-Expand™ Technology Our gel foam pillow is temperature regulating for a cooler, more satisfying sleep. It is 300 times more breathable than conventional memory foam.  Instantly refreshing, our rapid-response foam contours to your head and neck while providing the right amount of support. Pressure Relieving and Rapid-Response Feel Increased Air Flow with our Ventilation Channels Temperature Regulating Removable and Washable Padded Cooling Cover Meets CertiPUR® standards for content, emissions and durability Available sizes:Standard Low Profile 60x40x12cm | 23.5x15.75x4.75inQueen Low Profile 72x42x12cm | 28.3x16.5x4.75inQueen High Profile 72x42x15cm | 28.3x16.5x6inQueen Surround Profile 72x42x15cm | 28.3x16.5x6inKing Medium Profile 90x42x14cm | 35.5x16.5x5.5”