Serta Mattress Features: -Bunk Bed Set includes your choice of either two Twin mattresses (for twin over twin bunks), or one Twin and one Full mattress (for twin over full bunks) -FireBlocker® Insulator system helps block the spread of flames to allow for extra escape time in the event of a fire -10 year warranty against manufacturer's defects: no flip, no rotate, non-prorated -Use of mattress pad recommended Mattress Sizes: -Mattress is 8in thick -Twin Mattress: 39in W x 75in L -Double / Full: 54in W x 75in L Serta Warranty Information (.PDF) About Serta: Serta's consistent commitment to innovation, quality and service has paid off. Over the past decade, Serta has expanded its mattress line and become the fastest growing manufacturer in the country. For more than 70 years, Serta has consistently made investments into innovative features to ensure the comfort and durability of every mattress they sell