In original packaging item, may require some assembly. See link for more details:
Size: 72"
Note: Comparable, same brand The mattress does not give a specific size, it is 72" (rough estimate using a measuring tape)
https://www.walmart.com/ip/Fvbeaya-10-inch-King-Hybrid-Mattress-Box-Gel-Memory-Foam-Individually-Wrapped-Pocket-Coils-Medium-Firm-Pressure-Relief-Cooling-Sleep-Support-Adult/16289369566