This pillow is scientifically proven to reduce temperature build up by up to 50%. The Cool Revolution Comfort Pillow also features a soft and a firm side. One side is slightly softer, perfect for front sleepers or anyone who prefer a lower pillow profile. The other side is slightly firmer, ideal for back and side sleepers who enjoy a firmer, slightly higher pillow. Proven to eliminate 100% of pressure hot spots, this pillow will reduce aches and pains in your neck, shoulders and upper back. The luxury cover has one side ultra cool and one side normal too, so you have 4 different comfort and temperature combinations in one seriously good pillow.