Luxuriate in a sleep fit for a king with the premier offering in our most advanced collection yet, the Beautyrest Black® Hybrid KX-Class plush tight top mattress. It offers up to 21% more support where your body needs it the most.* Our new plant-based cooling technology also assists in providing up to 18% more cooling power to keep you comfortable as you fall asleep and throughout the night.** The Hybrid KX-Class takes it a step further with comfort, pressure-relieving, and support upgrades as well as 2X more memory foam*** compared to Beautyrest Black® Hybrid LX-Class and CX-Class models for our most comfortable mattress ever. A luxurious layer with silk, alpaca and cashmere provides unmatched comfort and breathability while Self-ResponseT Latex ensures individualized support for different parts of your body. Finally, 2000 micro-coils add another layer to our Premier Support System and provide precise conformability to create a first-class sleep experience. *in the center-third of mattress, exact percentage varies by model. **vs. Harmony Lux Collection, which cools for the first 20 minutes only. ***by weight.