9.5-inch firm mattress with an Ultra-Stretch ComfortLoft Cover of super-stretchable, mid-loft knit fabric designed to allow the mattress top layer to better conform to the bodySealy ComfortSense Gel Memory Foam: The latest innovation in gel memory foam, designed to respond to your bodys unique shape for more comfortable night? s sleep7.5-inch SealySupport Gel Base Foam, a high quality firmer supportive foam with gel added for additional flexible, durable supportUltra-Stretch ComfortLoft Cover: Super-stretchable, mid-loft knit fabric designed to allow the mattress top layer to better conform to the bodyCertiPUR-US certified mattress foam certifies this mattress foam is made WITHOUT ozone depleters, PBDEs, TDCPP or TCEP, mercury, lead and other heavy metals, formaldehyde, phthalates regulated by the Consumer Product Safety Commission and Low VOC emissions for indoor air qualityTwin measures: 75" L x 39" W x 11.5? HTwin XL: 80? L x 38? W x 9.5? HFull measures: 75? L x 54? W x 9.5? HQueen measures: 80? L x 60? W x9.5? HKing measures: 80? L x 76? W x 9.5? HCalifornia King measures: 84? L x 72? W x 9.5? HSplit California King measures: 84? L x 72? W x 9.5? HNeed to purchase 2 Sealy Conform mattresses to create a Split California King.