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Simmons Beautyrest Harmony Lux Carbon Plush Twin Mattress - 700810909-1010 Grill Accessories Learn more at nestBeautyrest Harmony Lux Carbon Series features our latest innovations in support; comfort; and cooling that work together in harmony for a better night's sleep. Its new and innovative coil design and support system; advanced pressure relieving foams; uniquely engineered cooling technologies and exclusive sustainable fabric technology makes this collection the ultimate choice in premium bedding. Featuring our RightTemp Wave Foam; our Harmony Lux Carbon