We ABSOLUTELY LOVE THIS MATTRESS! FINALLY, A GOOD NIGHT'S SLEEP!!! We replaced our old mattress with a Firm Mattress... My back was hurting so bad that I couldn't even "test it out". My husband made a GREAT CHOICE ! NOT ONLY are we sleeping soooooooo much better, my back feels GREAT!! WE HIGHLY RECOMMEND THIS PRODUCT!!!!!!!! THANKS, SERTA!!!!!!