Serta iComfort® Memory Foam features zoned support from memory foam layers for contouring pressure-relief and breathability. With alternating levels of firmness, ergonomically design support zones in every Serta® mattress are designed to keep your body aligned as you sleep. Medium - Perfect for all sleepers-side, back, stomach or combination sleepers CoolFeel™ Fabric keeps you comfortable throughout the night Our PerfectConform™ Memory Foam contours and cradles your pressure points for rejuvenating sleep Our 5 ZoneResponse™ Design provides head-to-toe comfort and support for restorative sleep Your new mattress may initially feel firmer than expected. Please allow up to 60 days to acclimate to your new mattress as it naturally adjusts to contour, comfort, and support you best CertiPUR-US(r) Certified Designed and Built in USA Adjustable Friendly 10 Year Warranty Mattress Top Type: Tight Top Mattress Type: Memory Foam Included: 1 Mattress(es) Features: Foam Layer, Cooling Layer, Temperature Regulating, Cushioning Layer, Zone Quilting, Full Support Additional Information: Conforms To Body, Suitable for Adjustable Bed Frames, Relieves Pressure Points, Eliminates Motion Transfer Manufacturer Warranty: 10 Year Limited Bed Size: Twin Xl Measurements: 38 Width/Inches, 13 Height/Inches, 79.5 Length/Inches Maximum Weight Limit: 850 Lbs Base Material: 100% Foam Comfort Type: Medium Care: Spot Clean Certifications And Listings: Certipur-Us Certified Mattress Height: 13" Country of Origin: Made in US Includes mattress only. Mattress plus box spring option also available.