An elevated 14-inch pillow-top hybrid mattress. It combines pressure-relieving foam comfort layers with individually wrapped pocketed coils for responsive support, motion isolation, reinforced edge support, and broad compatibility across side, back, stomach, and combination sleepers. Previously known as the Alexander Signature Hybrid. Construction and materials: 1-inch quilted THERMIC® phase-change cooling cover with 4 lb. gel memory foam for surface cushioning and temperature regulation. 3-inch Energex™ temperature-responsive comfort foam. Feel-specific comfort layers include Plush at 2.5 lb./10 ILD, Medium at 2.5 lb./22 ILD, and Firm/Lux Firm at 2 lb./30 ILD. 1 inch SmartFlow support foam, 1.5 lb./30 ILD, used as a transition layer between the comfort foam and coil support system. 8 inch 14.5 gauge reinforced-edge pocketed coil support system with individually wrapped coils for airflow, motion isolation, and edge support. Coil counts vary by size, up to 840 coils in King. 1-inch 3-lb. base support foam below the coil unit. Non-chemical hydrogenated silica fire barrier. Certifications and origin: Assembled in the USA. Foams are CertiPUR-US® certified. Foams are made in the USA using domestic and imported materials. Coils are made in the USA from imported and domestic steel. All foams are given time to air out in the factory to reduce residual off-gassing. Vegan mattress construction: CertiPUR-US® certified foams with no animal-derived materials or adhesives. Firmness and sleep fit. Available feels: Plush, Medium, and Firm/Lux Firm. Plush is designed for side sleepers, lighter sleepers under 140 lb., and shoppers who want a softer feel with pressure-point relief. Medium is designed for combination sleepers, back-and-side sleepers, average-weight sleepers, and shoppers who want support with moderate give. Firm/Lux Firm is designed for back sleepers, stomach sleepers, sleepers who need additional lumbar support, and shoppers who prefer a firmer surface with a pillow-top feel. King and California King sizes can be ordered with internal split comfort layers so each side has a different firmness. Sizes and dimensions Twin: 38 in W x 75 in L x 14 in H; 55 lb.; 390 coils. Twin XL: 38 in W x 80 in L x 14 in H; 60 lb.; 420 coils. Full: 54 in W x 75 in L x 14 in H; 85 lb.; 494 coils. Queen: 60 in W x 80 in L x 14 in H; 105 lb.; 644 coils. King: 76 in W x 80 in L x 14 in H; 115 lb.; 840 coils. California King: 72 in W x 84 in L x 14 in H; 115 lb.; 812 coils. Split California King, one side: 36 in W x 84 in L x 14 in H; 60 lb.; 406 coils. Setup, foundation, and care notes: The mattress ships compressed, folded, and rolled in a box; Queen, King, and California King orders are double boxed. Allow 12 to 24 hours after unboxing for the mattress to reach its intended height. Use an approved mattress foundation or adjustable base. Nest Bedding lists the HomeBase foundation, Balance Adjustable Base, Woodland Platform, and Metal Folding Frame as compatible options....