Our 100% Bamboo Viscose Split Top King Sheets are made for your Flex Top Adjustable King mattress sold by the sleep number bed store. Split-Top Fitted sheet has a 32-inch split from the top of the mattress and are Fully Elasticized and made with 6 corner pockets to fit up to 18 inches deep mattresses, it also comes with Fabric Wings (extra fabric) in the middle to cover mattress inner Splits so each side can move freely. Split Top king adjustable bed sheets Set Includes:One Flat Sheet measures 110 inches wide X 102 inches long, One Top split Fitted Sheet 78 inches wide X 80 inches long with 6 corner pockets to fit 18 inches deep Pocket mattress and Two King Pillowcases measures 20 inches wide X 40 inches long each.Care Instructions Machine Washable with Cold Water, Delicate cycle with mild detergent. No bleach, Dry this sheet set with Low Setting. To avoid wrinkles we highly recommend to put your Bamboo sheets on your bed right after pulling them out from your dryer.