King Sealy Posturepedic Response Performance Cooper Mountain IV Plush Pillow Top Mattress

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$665 - $1,031
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    Twin XL$709
    Cal King$1,031

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Comfort Guarantee Lowest Price Guarantee

If you're a side sleeper who needs great pressure relief or simply someone who enjoys a soft yet supportive level of comfort, the King size Sealy Posturepedic Response Performance Cooper Mountain IV Plush Pillow Top Mattress is a great way to go. The last generation was one of the most popular models not only from Sealy but on our site in general, and the newly improved version features several upgrades across the board. Scoring a rating of 7 on our Comfort Scale, this mattress has a soft initial feel and offers firm underlying support.

Significant improvements to the Cooper Mountain include the Comfort Loft Cover with MoistureProtect, a quilt that is specially designed to wick away moisture to help you sleep comfortably cool. Comfort is primarily provided through a variety of high quality polyurethane foams, all of which are CertiPUR-US Certified. Uniquely designed to promote airflow, a layer of Sealy Air Foam provides some initial body contouring. A layer of SealyCushion Extra Soft Foam aids in soothing pressure points to decrease tossing and turning as well as promote better blood circulation. The SealyCool Gel Memory Foam layer located in the center third provides additional lower back support, and it even promotes prolonged durability. Another layer of SealyCushion Extra Soft Foam guarantees deep down pressure relief, and it is appropriately designed to help side sleepers get the contouring necessary to prevent waking up with achy limbs. The Sealy Response Pro Encased Coil System provides support and consists of over 200 more coils than last year's version. This coil system is among the most forgiving on the market, and it contours well to your body's unique curves while simultaneously delivering deep down support. This system is especially beneficial for couples and those who expect a pet to jump into bed because when movement occurs on one side very little motion is felt on the other. It's also fully with an adjustable base compatible. Certainly one of the best edge systems available, the DuraFlex Edge also represents an improvement in edge support technology. It allows you to rest comfortably anywhere on the mattress without noticing much difference in comfort or support.

To summarize, if you like a soft comfort level this is one of the top choices available on our site. The attention to detail Sealy has given to this mattress is incredible, and it leaves nothing to be desired at this price point. This mattress comes complete with a 10-year warranty to ensure your satisfaction.

ComfortQuilt - Top of Mattress
Comfort - Padding Layers
Correct Back Support System
Box Spring - Foundation (optional)
Coil Counts:
Mattress Dimensions
Made In: Code:
Free In-Home Setup

Free In-Home Setup & Delivery
  1. TIMING & DELIVERY: From time of order, receive your mattress in about 1 to 2 weeks anywhere in the continental 48 states and Canada that is road accessible (Canada Details). Check your zip code when selecting your delivery option for an estimated delivery date.Remote locations may take an additional 1 to 2 weeks.
  2. SERVICE LEVEL: Delivery is super easy with In-Home White Glove delivery service. The delivery team will bring in and place your new mattress into your bedroom, unpack it and take away the packaging for you. (Delivery is up to 2 flights of stairs. Additional arrangements are subject to charge by the delivery carrier.)
  3. SCHEDULING DELIVERY: You will be called to arrange the delivery when your mattress has arrived at the local delivery agent, approximately a week after order. Someone must be home to accept delivery.
  4. FURNITURE & BEDDING: Furniture ordered at the same time will ship separately. If you would like us to wait until all the items on your order are ready to ship, please call us at time of order and we can arrange one delivery. Bedding ships separately via UPS.
  5. ADDITIONAL SERVICES: Mattress removal is available for an additional $49 when you select your delivery option online. For your added convenience, these other options are available for a nominal fee by phone only at 1-800-455-1052:
    • Evening delivery
    • Weekend or holiday delivery
100 night comfort guarantee

Our Mattress Guarantee Is Simple:

We want you to make your purchase with confidence. And we know that even after making a careful selection, sometimes people need a different level of comfort. If you wish to exchange your mattress, we will make an exchange for you for up to 100 days after delivery. (A difference in lower priced models is non-refundable. An increase in price requires payment for the price difference. Exchange covers same size, limit 1 exchange per customer.) All you have to pay is a $139 processing fee. We will cover all other expenses. Find out more about our guarantees and policies here.

All we ask is that you spend at least a few weeks getting used to your new mattress first, before we process an exchange. Sleeping on a new (or any different) mattress takes a few weeks to get used to, and with that familiarity you can know for sure you're making the right decision.
lowest price guarantee

Lowest Price Guaranteed or your Mattress is Free!

We guarantee that our prices are the lowest you can find anywhere - on or off the web! If you can find a comparable advertised mattress set for a better price somewhere else, simply call or email us with the store information or the website where you found it within 30 days of your purchase. We won't just match their price, we'll match 110% of the difference, or your mattress is free! Price comparison includes all applicable order charges including, but not limited to: product price, comparable service delivery charges, fees and taxes.

We will also price match 100% of the difference on our site within 30 days of purchase. Qualifying decisions on Low Price Guarantee claims rest solely with US-Mattress. Low Price Guarantee does not apply to used, damaged, returned, open box and display merchandise, vendor rollbacks and rebates, special purchases, promotional/doorbuster items, financing offers, clearance/discontinued, membership club or closeout prices.
Why did you choose this?
COMMENT: Gets good reviews, especially for the price. Returning our Purple Mattress and feeling hopeful! by Kim S 1/24/2017
COMMENT: Looked the reviews and other info videos. Looking forward to receiving it... by Steve G 1/21/2017
COMMENT: Good reviews and help from Chad at your company by Whitney P 1/17/2017
COMMENT: softness of the mattress by Markham S 12/31/2016
COMMENT: Have one like it all ready but it is 12 years old... by Garnet P 12/29/2016
COMMENT: I tried it out at another store first and it was more at another place. by Donald H 11/30/2016
COMMENT: Due to recommend from my friend by Bonnie W 10/25/2016
COMMENT: look so good. by Sung W 9/8/2016
COMMENT: reviews by cassandra m 9/5/2016
COMMENT: reviews by Steve g 9/4/2016
COMMENT: The price and the little video clip was helpful and informative by Merilyn O 6/2/2016
COMMENT: past experience by Joseph N 4/24/2016
COMMENT: Tried out several mattresses at a local store, found a match on this site for literally 50% the cost. by michael b 4/4/2016
COMMENT: all the great reviews by Ciara C 3/13/2016
COMMENT: comfort rating by Iva A 2/17/2016
COMMENT: ratings were good. price is good by Navin S 2/8/2016
COMMENT: The information provided and the reviews. by Antonio C 1/24/2016
COMMENT: I was advised that a pillow top would be best for us since we are both side sleepers. Also I looked at the specifics of the construction and compared them with other brands as well as looked at customer reviews of various beds. A year later we are still happy with our purchase every time we settle into this bed. by Cassandra M 1/23/2016
COMMENT: Price by David C 11/10/2015
COMMENT: Price was good. A lot of good reviews by Chester U 11/4/2015
COMMENT: Excellent price and customer service. by Sharon Y 9/20/2015
COMMENT: I have the queen size and we like it. by Denise M 9/17/2015
COMMENT: Slept on one at Hotel 2 yrs ago by Gary S 4/17/2015
COMMENT: medium firm with soften by kathy p 3/27/2015
COMMENT: Quality first, then price. Awesome shipping... by Stephen P 3/6/2015
COMMENT: good reviews and sealy posturepedic gel series. by ahmer s 2/16/2015
COMMENT: seems like a great mattress by Christin B 12/10/2014
COMMENT: I have had this bed in the past. This seems like a very good deal by Billy S 11/27/2014
COMMENT: name brand by wolfgang R 11/4/2014
COMMENT: Need a bigger and better mattress. Researched top mattresses for 2014 by Joy S 10/13/2014
COMMENT: For comfort scale. by Ho Y 10/9/2014
COMMENT: Slept on bed in Vegas and loved it. by Alicia D 8/30/2014
COMMENT: "Because Cody advise me so and I listened to his advise...." by Jay A 6/27/2014
COMMENT: Comfort level was a 6 and it is the most popular mattress sold at US-Mattress which makes me feel that others really like this mattress. by Angela H 5/10/2014
COMMENT: friends by Monte B 5/8/2014
COMMENT: Great Price. Tested at mattress store and loved. by Scott G 1/21/2014
QUESTION: Will this mattress work on an adjustable base? by Ian F 8/15/2015
STAFF ANSWER: Mattress is adjustable base friendly. by Jamie B 8/17/2015
QUESTION: Where can I go to test this mattress out Or something comparable I have an older Sealy Post., and it's holding up nicely. by Roxane D 2/1/2015
STAFF ANSWER: Any local mattress store in your area that sells Sealy may have this on display. We have stores in Michigan and North Carolina. by Jamie B 2/3/2015
Sealy Posturepedic Response Performance innerspring mattresses offer exceptional full-body support with ease of movement, for that sleep-on-top feeling. Exclusive Posturepedic Technology is used to deliver the stable, all-over support you want, with reinforced support under the heaviest part of your body for a truly comfortable night's sleep.
King Sealy Posturepedic Cooper Mountain III Plush Euro Pillow Top Mattress
4.5 Stars based on 209 Review(s)
Minneapolis, MN
2 Stars

Way too soft, poor shape, little support
March 21, 2017
This seems like it should be a 10 for soft, not an 8. If clouds are your thing, you may like it. It's soft which is nice at first, but with the level of softness comes poor center support, poor neck support (think your midsection where the weight is sinks in, your head sinks and slopes a bit, feet are higher)... if you should roll to the edge of the mattress or sit up there, the edge completely gives in. I'd think this would be hard on older folks especially.
Ok material quality
Way softer than we thought, poor support, body aches, seems warm, edges collapse with weight, the middle sinks!

3 Stars

Nice mattress for smaller folks
January 17, 2017
Delivery went well. Mattress in good shape on arrival. Comfortable for sleeping on your back. Significant hip pain when sleeping on your side. Probably because of my size (230).

Littleton, CO
5 Stars
I would recommend this item to a friend.

Great mattress
January 6, 2017
I've had this for about a month and still love it! It's very comfortable yet still firm enough to be good for my back. I still have time in my 100 days but I don't plan on returning this. Please note that ANY mattress you buy will be more firm in the first 30 days, kind of like a shoe, you need to break it in. I'm happy with the purchase and had no problems with delivery or ordering! I went to many mattress stores to get a feel of what I wanted, told the online chat person and it's perfect.
Comfort Price

Gaithersburg, MD
5 Stars
I would recommend this item to a friend.

Saved my back
January 3, 2017
I'd been sleeping on an ancient mattress that was gradually maiming me (only a slight exaggeration). I ordered this mattress on a day when I couldn't take it anymore, and it's been a life saver. I actually look forward to going to sleep now since I can sleep through the night and wake up without pain. My smartest purchase of the year.

Arlington, VA
5 Stars
I would recommend this item to a friend.

Happy Customer
December 29, 2016
I am pleased with my mattress set. The delivery was on time. I have no complaints.

Los Angeles, CA
5 Stars
I would recommend this item to a friend.

Give it Time
December 2, 2016
When I first received my mattress I was ready to return it. But obviously returning a mattress is a lengthy process so I thought I should give it a fair trail, especially considering US-Mattress's generous 100 day return policy. The first week or so the mattress was more firm than I expected, but after a couple of weeks it broke in and is really soft! The reviews on this mattress were very accurate.

5 Stars
I would recommend this item to a friend.

good quility
December 1, 2016
very comfortable but delivery is a little bit late

Gilboa, NY
5 Stars
I would recommend this item to a friend.

Very Happy - Great Company
October 15, 2016
This was my first time ordering a mattress online. After a lot of research, and reading reviews, I went ahead and placed my order. I am very happy and pleased with the purchase. The price was fantastic, and free shipping. I have not much stomach for the mattress stores. With different names for the same product from one store to the next. Worse then buying a car. The mattress arrived very well packaged and protected during shipping. I would buy from US Mattress again.
Well packaged for shipping. Pillowtop is awesome. Very comfortable.
None so far.

Hayward WI
5 Stars
I would recommend this item to a friend.

Quality product
September 26, 2016
This is the upgraded version of the mattress we bought 14 years ago. Loved that one, love this one even more.
Comfy, well made
No heads up on delivery, but luckily I followed up and found it it was coming that day.

Bluffton, SC
5 Stars
I would recommend this item to a friend.

Awesome bed
September 15, 2016
Purchase, delivery and whole process smooth and easy. Lower back pain relieved in first days of use! Great product, great company to work with. Will only buy beds from US Mattress from now on!

5 Stars
I would recommend this item to a friend.

Value for Money
August 21, 2016
Good Mattress in this price range

Orange County, CA
4 Stars
I would recommend this item to a friend.

Almost 5 stars
July 31, 2016
I really liked the website, it was easy to order, customer service and the delivery guy were very helpful and friendly and the mattress is comfortable and matches the description, except for the length- it is about 1.5 inches shorter than advertised. I haven't contacted the company, it's not a huge deal and maybe I'm not measuring it the way they do. That was the only con of this experience.
Website Customer service Delivery Mattress Comfort and Quality
Mattress dimensions

Garysburg NC
5 Stars
I would recommend this item to a friend.

Sealy Posturepedic Cooper Mountain lll Plush Pillow Top Mattress
May 29, 2016
Mattress is great. Very comfortable.

Washington, DC
5 Stars
I would recommend this item to a friend.

Very happy
May 24, 2016
I had a Stern & Foster that after 5 years had developed a terrible sag; I purchased this as its replacement and so far (4 months in), I couldnt be happier. Extremely comfortable (I prefer soft to firm.

Madera, CA
5 Stars
I would recommend this item to a friend.

Excellent Mattress
May 20, 2016
Love the mattress; it is as you claim it to be.

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