Sinomax Sleep 4-inch Contour Memory Foam Mattress Topper

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ITEM# 17340576
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ITEM#: 17340576

Maximizing the memory foam experience, this topper features dual layer foam support. Get gentle and conforming lift with the top memory foam layer while the bottom support foam layer adds pressure point relief to key areas with its curved design. Wrapped in a diamond pattern cover with flexible deep pocket skirt, the topper will hold in place while it leads you to sound sleep.

  • Measures  inches thick
  • Density: 3 pound
  • Cover: Quilted, breathable
  • Cover care instructions: Machine wash
  • 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 Medium
Dimensions See Descrpition.
Warranty 1 year Limited Manufacturer
Model Number 0318-SMX-TPR
Country of Origin China
  • Most Recent

  • 4-inch?
    Verified Purchase

    I have to agree with Theresa's December 2015 post, topper arrived quickly, but after more than 48 hours it's still not 4-inches nor is it flattened. I'm not returning it and wish I'd gotten it for a lower price. 😞

    Read More
  • Missa
    Verified Purchase

    Great item, a little firm but overall great.

    Read More
  • love this 4 inch memory foam topper!
    Verified Purchase

    very comfortable,sleeps very well!

    Read More
  • Not as described
    Verified Purchase

    Shipping was fast - but its been almost a week since I unwrapped and put on my bed and parts of the memory foam are still compressed and extremely hard. Also, it is nearly all foam with very little memory foam - and in some places, it is only 2 inches thick. If I can figure out to wrap this thing back and box it - I will return it. Extremely disappointed.

    Read More

Questions & Answers

  • Q:

    "on the memory form topper do you put the bottom sheet directly on the foam topper or do you use a mattress cover on the foam topper first"

    • A:

      Hello sandy, you can choose to use a mattress cover over the foam topper or place the sheet directly on the topper, it is a matter of personal preference. If you plan on using a mattress cover, I would suggest placing it over the topper. Thanks for shopping with us!

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.