Tempur-Proadapt® Series Medium    It’s a breakthrough in material science, five years in the making. Finer and mor e tightly closed than our original TEMPUR ® material, TEMPUR-APR ® has an innovative cell structure that dramatically increases its ability to adapt and conform to your body. Every muscle. Every curve. Every point of contact between you and the mattress is more fully balanced and supported. Force and motion are more fully absorbed. Pressure points in your shoulders, hips and spine are more fully alleviated.    TEMPUR-ProAdapt ™ beds also come equipped with our cutting edge SmartClimate ® Dual Cover System – the industry’s first fully removable, machine-washable cooling cover. Developed and designed by our own team of textile engineers, this sleek and breathable two-piece system works together to cool and relax you.   Key Highlights   Tempur-ES ®   :  The tighter, slightly rougher cell structure of TEMPUR-ES® c reates a softer feel that works in combination with other layers to support and relax.   Tempur-APRTM:  Our latest innovation and our most pressure-relieving material ever – made for deeper, more rejuvenating sleep.    Smartclimate ® Dual Cover System:  Next-generation technology featuring a zip-off, cool-to-touch outer layer and super-stretch inner panel for convenience and comfort.    High-Stretch Performance Panel:  Inspired by athletic apparel. Designed to be lightweight, breathable and to enhance the pressure-relieving power of your mattress.    Cool-To-Touch Removable Cover:  The industry’s first removable, machine-washable cooling cover. Crafted from ultra-high molecular weight yarn it moves heat away from your body. A sleep 360-degree zipper makes for easy on and off.      DISCLAIMER:  Split King and California King are each made up of 2 pieces. You must select a quantity of 2 for these sizes for a complete foundation set.   Don't forget to check your delivery type and print off your Delivery Checklist & Delivery Guide Tempur Features     Mattress Top Type: Tight Top Mattress Type: Memory Foam Included: 1 Mattress(es) Features: Breathable, Cooling, Removable Cover, Antimicrobial, Foam Layer, Cushioning Layer, Adjustable Base Compatible Additional Information: Conforms To Body Manufacturer Warranty: 10 Year Limited Bed Size: Twin Measurements: 13 Depth/Inches, 74 Length/Inches, 38 Width/Inches Base Material: 100% Polyethylene Comfort Type: Cushion Firm Care: Spot Clean Certifications And Listings: Cpsc - 16 Cfr 1633 Compliant Country of Origin: Made in US Includes mattress only. Mattress plus box spring option also available.  This mattress meets the requirements of 16CFR Part 1633 (federal flammability (open flame) standard for mattress sets) when used with foundation