Founded in 1931, Illinois?based Serta? is the largest mattress brand in the United States; while perhaps best known for its flagship mattress, the Perfect Sleeper?, the company manufactures gel?infused memory foam, natural Talalay latex and inner?spring mattress along with a line of baby bedding accessories. The range of products includes iComfort? Insight EverFeel? foam core enhanced gel memory foam mattress sets; iSeries? super pillow top gel memory foam low profile mattress sets; Perfect Sleeper? super pillow top mattress sets, firm mattress sets and plush mattress sets; twin XL mattresses; queen size mattresses; full size mattresses; king and California king size mattresses; premium quality mattresses; firm support mattresses; American?made mattresses; soft quilted cotton lap and burp pads with a waterproof inner layer; large multi?use quilted waterproof pads for cribs, porta?cribs and playards.