The 2920 Mattress – California King Size. The Cal King is the longest mattress and is great for tall folks so your feet don’t dangle off the end. It’s 4 inches longer than a king, but also 4” narrower. The 2920 Mattress was designed to provide great support for a Better Night’s Sleep and features our trademarked “Comfort Stack” Sleep Solution to solve for Support, Pressure Relief, Temperature Regulation, and Durability. Made in the U.S.A., independently tested by Leggett & Platt, and comes with a 10 Year Warranty and 100 Night Risk Free Trial.