The Beautyrest Black® K-Class firm pillowtop mattress offers up to 21% more support where your body needs it most: the center third.* With help from our new plant-based cooling technology, the collection provides up to 18% more cooling power to keep you comfortable as you fall asleep and throughout the night.** Our most comfortable mattress ever, the K-Class also features comfort, pressure-relieving, and support upgrades including 10X more memory foam*** compared to Beautyrest Black® L- and C-Class models. A luxurious layer of silk, alpaca and cashmere provides unmatched comfort and breathability while Self-ResponseT Latex ensures individualized areas of entire-body support. Lasty, 2000 micro-coils add an additional layer to our Premier Support System for precise conformability. You'll wake up feeling invigorated and ready to take on the day. "*Exact percentage varies by model. **vs.the Harmony Lux Collection, which cools for the first 20 minutes only.***by weight"