Sinomax Sleep 3-inch Gel Memory Foam Mattress Topper

Out of Stock

Plus, Free Shipping & 5% Rewards back for only $19.95/yr Learn More




5% Rewards

On Every Order

Free Shipping

On Every Order

Exclusive Rewards

Earn Big - Up to 40% back!

Free Returns

On Select Clothing & Shoes

Exclusive Offers

Straight to Your Email Inbox

5% Dining Rewards

Get Paid to Go Out Tonight

ITEM# 17340575
    Notify me when it is back in stock!

    Enter your email address, we will notify you if it comes back in stock.

Love this item?

Save it to a list so you can find it anytime!


something went wrong.

Please refresh the page and try again.


ITEM#: 17340575

This Sinomax memory foam mattress topper provides the same amount of comfort as an actual mattress - simply attach it to your current mattress and you're ready for a restful night's sleep. The Sinomax topper has two sides - a traditional foam side to keep you warm and a gel-infused side to keep cool. This topper is resistant to dust mites and germs and is designed with easy clean-up in mind.

  • Measures inches thick
  • Density: 4 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.

Once opened this product is non-returnable


Type Flat Topper, Mattress Topper
Thickness 3 Inch
Memory Foam Type Gel Memory Foam, Memory Foam
Density 4 Pound
Firmness Plush Firm
Dimensions See Details
Warranty 1 year Limited Manufacturer
Model Number 0672-SMX-TPR
Country of Origin China

Product Reviews

5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
  • Most Recent

  • nc nurse
    Verified Purchase

    the foam is not as firm as I would like, it seems to melt with body heat and forms a pocket that is hard to turn over. it has a cover that is well made and the thing is very heavy to carry, I have taken it off my bed for now.

    Read More
    prettypony Mar 14, 2016
  • relax
    Verified Purchase

    this mattress is something that keeps your body cool and very comfortable.I loved it so much I bought one for my daughter and son in-law.

    Read More
    Doreen H. Feb 4, 2016

Questions & Answers

  • Q:

    "Why did you choose this product?"

    • A:

      Praying its a good mattress topper and will help with mine and my husbands back.

    • A:

      It's a cool topper and already have one and love it.

    • A:

      not sure why! Just a hunch?

    • A:

      It was the only gel king memory foam topper that had 4lb density that you have. I will test it out.

    • A:

      I have a 2.5 one and am very happy with it. We have had it for several years now and no problem arole m with it. We had purchased a 4" one from Amizon ,different brand which came without a cover and it split all over.

    Read more Read less

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.