Measurements: (W) 30 x (L) 40cm. Gel pillows: Get a pack of two gel cooling pillows. Four: Upgrade to get a pack of four pillows for both you and your partner. Benefits: Good for headaches, sunburn, hot feet, hot flushes or just to cool down. Filling: Filled with a harmless gel that delivers a cooling effect when in contact with your body. Comfortable: If you’re someone who overheats during the night then these cooling pillows are just what you need to help control the temperature.