Serta Perfect Sleeper Elite Emerald Oaks Firm Mattress Cool Action Gel Memory Foam (King) The all New Serta Perfect Sleeper Elite Eastport Firm mattress offering the best features from Serta's exclusive technologies for the ultimates nights rest. Mattress Height Approx 13" The Serta Perfect Sleeper is the Only Official Mattress of the National Sleep Foundation (NSF), designed with input from the NSF to help address 5 common sleep problems. Helps reduce tossing and turning with Cool Action Gel Memory Foam -Encourages proper back support and alignment with the Custom Support Individual Advantage Innerspring - Promotes a balanced sleep temperature with Cool Balance Elite Technology Minimizes impact from partner movement with our TrueSense 4.0 design with 4-way motion isolation - Resists sagging and edge roll-off with Sertas ComfortLast Construction plus Total Edge Foam Encasement Call 800-996-4340 for More Information - Made in the U.S.A - 10 Year Non-Prorated Manufacture Warranty