BOYD Planet Sleep mattress is made with “open cell” memory foam, which promotes air flow and relieves pressure. Open cell foam contains billions of balloon-like cells with tiny air passages in and around them where air can escape. This breathable structure promotes the dissipation of heat, which keeps you cool and comfortable throughout the night. A closed cell memory foam mattress will “push back” when you lie down because the air in the sealed foam cells has no where to go. A BOYD open cell memory foam mattress will “melt” and spread the air pressure to adjoining cells to provide you with soothing comfort and contouring support. Planet Sleep memory foam is manufactured using a certified eco-friendly process, utilizing pressure rather than chemicals to control the foam's properties. This process produces a more consistent cell structure resulting in higher quality memory foam with enhanced performance and strength characteristics. Harmful VOC vapors are also contained and prevented from being released into the atmosphere.