Mainstays 6” Medium Firm Memory Foam Mattress, Twin

This mattress exceeded my expectations for the price. It arrived well packaged and expanded quickly after opening. The 8-inch thickness provides good support while still being comfortable, especially for sleeping on my back and side. The medium-firm feel is balanced, not too hard and not too soft. It offers great value for money and feels durable and well-made. I've been sleeping much better since using it and would definitely recommend it to anyone looking for an affordable and comfortable mattress.

So I waited a copy of days to post my opinion! Me and hubby were having trouble getting rest ..so I decided to buy this item …let me tell you it is very comfortable. It expanded amazingly well maybe even bigger.. I follow all instructions—- no smell ..All comfortable I got a queen size price was good. Thank you

After letting the mattress sit for about 36 hours, we tried it out for one night. I have terrible back pain from my work but this mattress was like sleeping on clouds. Very comfortable

Excellent!! Soft, perfect when you add a 3 inch egg crate topper, and a bamboo topper! (Bad back). The bed I ordered will tell the tale when it gets here Monday. Otherwise, this mattress alone is well worth the price just by itself. I definitely would buy again, and may do just exactly that. Excellence!!

this is the best sleeping mattress! i have back problems but when i lay on this in my work room omg i feel like a burden has lifted. it's like sleeping on air. for best results let it sit to form 48 hours. theres no smell it comes with a plastic cutter so you won't cut the mattress. i will be purchasing a bigger one for my other bed!

I'm almost 70 and i need a firm mattress because of a shoulder/hip injury 20 years ago. I love memory foam mattresses because the twin, my size bed, are usually under $100 which allows me to get a new mattress when i need it and that's usually every two years. This mattress isn't the most firm that i have had but it's good. i have a sheet of plywood on top of my box spring so that helps keep my body from sagging into the mattress. i use to buy the 8" but this year i had to see the help of a chiropractor, and they, both doctors, told me to do 6". A memory form mattress usually sinks to half the thickness of the mattress so an 8" will usually create an 4" sag which means my hips, the heaviest part of your body, will sink into an 8" memory foam mattress 4" as compared to only 3" off a 6" thick firm mattress. My hip needs to keep aligned as does my shoulder so i can wake up pain free. As the mattress ages, the pain increases because of the sag. my old 8" wore down into a deep sag that caused pain until i finally replace it, but the 6" only sinks 3" and my hip can handle that depth of sink which makes the 6" a better mattress for my needs. If your body needs firm support always get the thinnest mattress at the sage from use isn't deep. This mattress is good but it's more of a medium firm so i think I'll be buying a new mattress in a year but time will tell and I'll edit this review as soon as something charges. i bought it for $80 which is about the average i spend. i have bought $150 but their were 8"-10" and the same from use was painful because it was so deep. Thinner naturally doesn't compress as much because there's less to compress.

I got the mattresses 2 days later. I unwrapped it sat it on my bed to expand. Didn't notice any chemical smell coming from the mattress itself. I completely removed the plastic packaging. After 30 minutes of expanding it's close to 8 inches, suggested expansion time on the manual says up to 48 hours to fully expand. Will update on firmness but so far the quality feels fair for the price.

I honestly thought that these mattresses were going to junk for being only 6 inches deep but once I unrolled it which was easy as they did supply an envelope opener to unpack safely - it's darn comfortable! I bought 2 in a different sizes for bunk beds and they're super comfy. Can't feel the bars under the bed and my kids are loving the memory foam as it's their first one! Price was great too!

I bought this for the price. But not value for money at all. First of all it didn't inflate fully even after leaving for 14 hrs and it's not firm at all. It is supposed to be medium firm. It's giving me back pain and Walmart won't even take this back without me packing it up and going to store.

There is another review from a guy that submitted a photo measuring the mattress and I completely agree with him. This is not 8 inch, it is 6 inch. This is not medium firm, it is soft. in 2024, I bought this product off the shelf from a store in Gulfport, MS for my dad's spare room. It was an amazing product. So I bought it for myself, in 2026, this time online. Either the manufacturer has significantly changed the product and is trying to pull a fast one or I was delivered the wrong thing. It's a glorified mattress topper