Ottomanson King 8″ Vanguard Firm Mattress – Made in USA – Durable Support & Comfort – CertiPUR-US Foam & Reinforced Coils – Fiberglass-Free – Bed in a Box

Customer Reviews (31)

1. 

   Sunshine :) – April 14, 2025

   Rated 5 out of 5

   This is a super comfortable mattress, it’s a little firmer than I expected however it has gotten softer after being open for 2 months. I’m really impressed that how it looks so much smaller when arriving in a box but once you open it it really expands. This is one of the most comfortable mattresses I’ve ever had! If the twin bed as expected.

2. 

   ku – April 17, 2025

   Rated 3 out of 5

   I was replacing a low cost twin mattress from Big Lots that I had for +5 yrs. Being a plus size, small woman it was already worn out by the end of year. Since it takes years for me to save for a replacement I took a chance with this mattress in a box. When mattress arrived, I followed the instructions to let it expand for 24-48 days. By day 2 the mattress was rock hard. I came back here to see if I accidentally ordered the rock firm one. I didn’t, so by the end of the second day, it seemed ok to sleep in. I was uncomfortable for the first week. I sleep on all sides which this mattress claims you can do.
   The 2nd week going into the 3rd, there was already a sag, a dip, in the middle. I’m coming on a month this week of having this mattress. The description says the weight cap. is 400lbs., I’m 240lbs. I don’t recommend this mattress if your plus size.

3. 

   Mil – April 26, 2025

   Rated 5 out of 5

   It’s made with high-quality materials and has excellent overall quality. It’s comfortable and soft, with a great size. It does take about 2–3 days to fully expand, but once it does, it performs really well. Considering the price, it’s definitely worth it. Overall, I really like it.

4. 

   Rob & Ton – May 1, 2025

   Rated 4 out of 5

   This mattress truly lives up to its promise of firm support and durability. The hybrid design with individually pocketed coils provides excellent structure without feeling too stiff, and the foam adds just the right amount of comfort. I appreciate that it’s made in the USA. It came well-packaged and expanded quickly with no odor. If you’re looking for a firm, supportive bed that doesn’t sink or sag, this one is perfect. Great value and quality!

5. 

   Erica – May 6, 2025

   Rated 5 out of 5

   This Ottomanson Vanguard mattress is fantastic! As someone who needs firm support, this 8-inch mattress delivers perfectly. Knowing it’s made in the USA with CertiPUR-US foam and reinforced coils gives me real peace of mind about its durability and comfort. Plus, the fact that it’s fiberglass-free is a huge bonus. It arrived conveniently as a bed in a box and expanded to its full size quickly. I’m sleeping soundly and waking up feeling refreshed. Definitely a 5-star purchase!

6. 

   Ramsey Music LLC – June 2, 2025

   Rated 5 out of 5

   I have the 11 inch twin and the firm hybrid and it’s perfect. So far so good. No issues at all. It arrived vacuum sealed and rolled up. Once unrolled and cut open it expands really fast. Within a few seconds it was already to a regular mattress thickness. It’s very nice and comfortable. I highly recommend this mattress.

7. 

   Precise Disarray – June 15, 2025

   Rated 5 out of 5

   I have the 12″ twin which is being used as part of a DIY king and a half set. SO full sized adults are sleeping on this. And a couple of dogs.

   This is a hybrid mattress which is a great combo for support and longevity. We love beds in box, and always go with a hybrid option. The coils are reminiscent to old school mattresses. They are supportive and dont swallow up the body. Less likely to create a dip in bed over time.

   The quality is there. Edges are clear and hold up. Good stitching. Nice feel.

   Perception of medium, firm, soft, medium firm is greatly dependent upon the user. A heavier person will find mattresses softer than a lighter person. I am a big (300#) and tall (5’11”) old chonker, and tend to prefer slightly firm beds. This has give but still supports me very well. I would say that “medium firm” is a reasonable description.

   We used to just sleep in a king, then when we got big dogs they wanted to sleep with us. So then we made adjustments, including having two fulls, then a queen and a full, which is the equivalent of a king plus a twin. My husband doesnt want the dogs on his side of bed, and I prefer the dogs to be squished up on me, so I decided to make one bed a kink sized bed, then he can have the twin. Still same size overall, and still smooshed up together, but the line it the bed will favor the dogs staying with me on the king. Took me awhile to get everything to make this happen, hence taking awhile to review.

   No issues so far, quite pleased with the quality. I wasnt sure if it was going to be a pricy “cheap” bed. But no, it is a well made bed (twin). I will update if it starts to sag or fall apart.

8. 

   Belle – July 1, 2025

   Rated 5 out of 5

   First day review. Twin firm 8 inch mattress. I have absolutely no complaints. Took about 30 seconds to fill up to 8 inches. Almost couldn’t get the plastic all the way off before it was fully expanded. Bought for an eight year old and he loves it already. Been jumping on it and it has a good thickness. Edges aren’t the best but not horrible dip when you sit on them. Definitely firm but a soft firm. If that makes sense? Added a 3 inch firm memory foam pad and a pillow top cover. Just about perfect with those added. Gives it a more medium firm feel. Will probably use this same brand to upgrade all our mattress over the next few months. If your mattress search has been anywhere as awful as mine just go with this one. Will give an update if it fails to meet my expectations over the months.