Sinomax Sleep 4-inch Upper Echelon Memory Foam Mattress Topper

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ITEM# 17340547
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ITEM#: 17340547

The 4-inch Upper Echelon Memory Foam Mattress Topper by Sinomax Sleep enhances the sleep surface while providing targeted elevation options that aid in common sleep discomforts such as acid reflux or circulation. Layered in pressure relieving memory foam and firm base foam, this topper's foam elements are molded in wedge shapes that allow for inclining or declining where needed. Each wedged layer is 3.5 inches sloping to .5 inches for a 4-inch overall high profile. For firmer support and lift, use the thicker base foam side. For more gentle support and less lift, use the thicker memory foam side. Wrapped in a soft diamond pattern cover, sleep better and dream higher with this topper tonight.

  • Measures  inches thick
  • Density: 4 pound
  • Cover: Quilted, breathable
  • Cover care instructions: Spot clean
  • Memory foam is resistant to dust mites and is naturally antimicrobial
  • Originally designed for NASA, this space age foam cradles your body, reducing pressure points that cause tossing and turning
  • Temperature sensitive foam adjusts to your body temperature so you stay warm
  • Improves circulation while reducing pressure points that can disrupt your sleep
  • Eliminates motion transfer and uncomfortable pressure points
  • Never needs turning
  • Disperses your weight evenly
  • Meets all flammability standards

  • Twin: 4 inches high x 39 inches wide x 75 inches long
  • Full: 4 inches high x 54 inches wide x 75 inches long
  • Queen: 4 inches high x 60 inches wide x 80 inches long
  • King: 4 inches high x 76 inches wide x 80 inches long

Memory Foam Tips:
  • Remove from packaging within 72 hours of receipt to maximize memory foam expansion.
  • This product arrives very tightly packed. Unwrap and allow 48 hours for this product to return to its original shape.
  • Being sealed in plastic packaging sometimes traps odors. After unwrapping, allow product to air for a few hours.
  • Due to machine-cutting manufacturing processes, there may be slight variances in the dimensions of this product.

Due to the nature of Memory Foam the firmness level of every item is unique. Please be advised that even similar products may produce different firmness results.

Click here to view mattress topper buying guide.

Once opened this product is non-returnable.


Type Flat Topper, Mattress Topper
Thickness 4 Inch
Memory Foam Type Foam, Memory Foam
Density 3 Pound
Firmness Firm, Medium
Dimensions See Details
Warranty 1 year Limited Manufacturer
Model Number 0317-SMX-TPR
Country of Origin China
  • Most Helpful

  • On second one
    Verified Purchase

    I had to get a replacement topper because the first one looked like a crater landed in the middle. The second one has layed flat going on a week and some of it has risen to the 4" depth but other parts will not conform. Although I do sleep on the crater one still it is comfortable on my side. If I can only get one that inflates or rises from the compressed state like it should! I don't know how long the are boxed up compressed but mine has in the tag 2007. That's going on 9 years since it was made.... So I don't know if it'll ever conform correctly. Hope you have better luck than I!!

    Read More
  • Rhonda
    Verified Purchase

    I ordered a queen size and it was larger than expected.

    Read More
  • Not as per Mark
    Verified Purchase

    I got this one week before but it was still not expanded from one side.

    Read More
  • Most Recent

  • mr
    Verified Purchase

    it is not what ithought I think its fake

    Read More
  • A good Memory foam mattress
    Verified Purchase

    I get better nights of sleep thanks to this memory foam mattress

    Read More
  • great, comfortable
    Verified Purchase

    it's just slightly extended out from my queen sized bed, but overall great quality and comfort

    Read More
  • Sito
    Verified Purchase

    Ordered this for Christmas. Came on time and opened it on Christmas Eve. Supposed to let it rest for 48 hrs was my understanding. It is now the 28th and it still has not reached usable status. half has gotten to about 3 inches while the other half has not gotten to even 2 inches. How long before we are to assume that it is not going to make it to the proper thickness? I can't find a place where we can even ask for assistance. Paid for a 4 in topper! Very disappointed as this was for my husband who is ill.

    Read More
  • Most comfortable sleep
    Verified Purchase

    I purchased this topper for our motorhome. the mattress in it was ok, but hard. And I'm really spoiled from my home bed. We are now entering our third week of travel and its perfect. Never have we been so comfortable while traveling.

    Read More

Questions & Answers

  • Q:

    "Why did you choose this product?"

    • A:

      Trial and Error - Beds too hard

    • A:

      4 inches and price

    • A:

      Just went with the reviews.

    • A:

      It seems that it will work with my sleep sofa

    Read more Read less
  • Q:

    "Is this made in the USA?"

    • A:

      Hello wolves144, this is made in China. Please let us know if you have any further questions.

Shopping Tips & Inspiration

Shipping & Returns

Contact Information
Shipping Information:

Our standard shipping method is ground shipping. We also offer expedited shipping for most items. Your final shipping cost and estimated delivery timeframe will be available at checkout.
Standard shipping details
Expedited shipping details

Standard Return Policy:

Items must be returned in new or unused condition and contain all original materials included with the shipment. More Details

FINAL SALE EXCLUSION: Items marked as FINAL SALE are not returnable unless the problem you experience is the result of our error.

For your protection, all orders are screened for security purposes. If your order is selected for review, our Loss Prevention Team may contact you by phone or email. There may be a two business day delay to process your order.

** Most Oversize orders are delivered within 1-4 weeks. Some orders may take 6 weeks to be delivered.