I bought this full size 12 inch high Membermark firm mattress from Sam's Club less than 2 years ago with an adjustable membermark base. I turned the mattress in all 4 positions but it lost its firmness and uncomfortable in flat position. I weigh 230 pounds. It has a 10 year warranty, but no idea how to act on it and with who.

This mattress is a quality product. Nice looking but most importantly, comfortable and affordable. We purchased the medium firm mattress. Some reviewers mentioned the sides collapse when you sit on the edge. That isn't exactly what happens, they do give way but it doesn't dump you into the floor. We've been sleeping on it for months now and get a great and comfortable night's sleep. Some reviewers said the mattress is not firm enough. We found that after sleeping on it for a while, our bodies sort of adjusted. This may not make sense, however, we have no back pain or discomfort due to a mattress that is too soft. My husband needs a certain amount of support due to mild back issues and this mattress delivers what he needs. It isn't too hot even with this summer's heatwave. I do recommend this mattress and would purchase it again.

We have bought two of these twin size beds. The first one was medium softness for my college-aged daughter. She loves the bed. The edges were a little too soft when sitting on the side of the bed, but super comfortable for sleeping. When my daughter moved out, we bought the same mattress in firm. I was worried the firm would be too hard, but it's perfect for me. So comfortable. You really can't beat the quality and comfort of these beds.

Comfortable and excellent price

Good price and great quality

Super easy install. Had a weird smell at first, but dissipated after airing out.

Excellent product. Very comfortable. Totally recommended.

Great price and comfortable

Great mattress for the price! Never had one in a bag but it came up nicely and she really likes it.

The mattress never got to the full 12 inch height that it was supposed to get to. In addition, the medium firmness is significantly less firm than we expected.