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Quick Picks at a Glance
Prime WhatsBedding 5 Inch Queen Mattress Topper
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Pros
- Extra thick 5-inch profile noticeably softens firm beds
- Cool to the touch bamboo viscose with breathable air channels
- Secure non-slip deep pocket design fits a wide range of mattress heights
- Soft, quiet and hypoallergenic fabric comfortable for sensitive sleepers
- Machine washable for easy maintenance
Cons
- Strong initial odor requires 1 to 2 days of airing out before use
- Not water resistant, so spills can soak through
- Adds significant height and may require deep pocket sheets
The WhatsBedding MTB005Q2 is a 5-inch queen mattress topper designed to add plush, pillow-top softness to an existing mattress. It is ideal for anyone with a firm or aging mattress who wants a softer, more cushioned sleep surface without buying a new bed.
Its standout feature is the breathable bamboo viscose cover paired with air fiber fill and airflow channels that help wick heat and moisture. In everyday use, reviewers note it feels thick and fluffy once fully expanded, stays cool to the touch, and creates a noticeably softer, cloud-like feel.
Build quality focuses on comfort and convenience, with a hypoallergenic, ultra-smooth fabric that is gentle on skin and a lined, quilted construction. The pull-on design includes an elastic deep pocket skirt that fits mattresses from 8 to 16 inches and helps prevent shifting or bunching overnight.
There are a few tradeoffs to consider. The topper has a noticeable initial odor and benefits from a day or two of airing out before first use, and it is not water resistant. Its added height also means you will likely need deep pocket sheets, and the plush feel is softer than what firm support seekers may prefer.
Overall, this topper delivers impressive loft, breathability, and stay-put stability for its category. If you want an affordable, machine washable way to transform a firm mattress into a softer, cooler, and more inviting sleep surface, it is a compelling choice.
Brand: WhatsBedding
Model: MTB005Q2
Size: Queen, 5 Inch Thick
Color: Blue
Fabric Type: Bamboo Viscose
Fill Material: Air Fiber
Firmness: Plush
Fit: Deep Pocket Skirt for 8 to 16 Inch Mattresses, Pull On Closure
Care: Machine Washable
Features: Lined, Breathable Airflow Channels, Non-Slip Design
Why Sizing Matters More for Cooling Toppers
Cooling mattress toppers work differently from regular padded covers because they depend on full, flat contact and airflow to move heat away from your body. Features like airflow channels, breathable bamboo viscose, and moisture wicking fabrics only perform well when the topper lies smooth and covers the sleep surface evenly. If the topper is too small, you lose cooling at the edges where you roll, and if it is too large, excess fabric bunches and blocks ventilation.
An incorrect size also creates comfort and maintenance issues that reduce cooling over time. A topper that hangs over the side can shift during the night, while one that is too tight pulls at the corners and strains the elastic skirt. Many hot sleepers pair a cooling topper with other temperature regulating sleep solutions, like a breathable weighted blanket option from our guide to the best weighted blanket for hot sleepers, but even the best pairing will not help if the base layer does not fit correctly.
How to Choose the Right Size Cooling Mattress Topper Step by Step
- Measure your mattress correctly. Start with a tape measure and record width, length, and height while sheets are off. Standard US sizes are Twin 38×75, Twin XL 38×80, Full 54×75, Queen 60×80, King 76×80, and California King 72×84, but always confirm your actual mattress dimensions since pillow tops and Euro tops can vary slightly. Measure thickness at the tallest point, including any pillow top, because that determines whether the skirt will fit securely.
- Match topper size to mattress size, not bed frame. Choose the topper size that matches your mattress label, not your headboard or frame size. A Queen topper on a Full mattress will overhang and trap heat along the sides, while a Full topper on a Queen leaves exposed warm zones. If you use a split King adjustable base with two Twin XL mattresses, you will need two Twin XL toppers rather than one King for proper coverage and independent movement.
- Check depth and skirt compatibility. Look closely at the pocket depth range listed in the specifications. For example, the WhatsBedding 5 Inch Queen Mattress Topper features an 8 to 16 inch deep pocket skirt with a non slip design that wraps securely around mattresses of various thicknesses. This wide range helps prevent shifting or bunching all night, which is essential for keeping those specially designed airflow channels open. If your mattress is unusually low profile under 8 inches or extra thick over 16 inches, you may need a different depth or add-on straps.
- Consider thickness and cooling performance. Thickness affects both feel and temperature regulation. A 5 inch option like the WhatsBedding model adds plush cushioning while still promoting airflow through its breathable bamboo viscose air layer. Thinner toppers around 2 to 3 inches tend to sleep cooler and work better if you already have a soft mattress, while thicker toppers provide more pressure relief but need good ventilation to avoid heat buildup. Think about whether you want to soften a firm bed or just add a cool to the touch surface without changing height too much.
- Decide on coverage for couples, pets, and movement. If you share a bed with a partner, child, or pet, full surface coverage ensures everyone benefits from cooling and no one ends up on an uncovered warm edge. For couples with different temperature preferences, some choose dual Twin XL toppers on a King bed to create separate zones. Also consider washability if pets sleep with you, a machine washable design makes cleaning simple and helps maintain a hygienic and dry sleeping environment. Pairing your topper with other cool sleep accessories, such as the options in our 8 comfortable blackout sleep masks for deeper rest, can further improve comfort without adding heat.
- Verify care, materials, and fit guarantees. Review fabric and care details before you buy. Hypoallergenic, ultra smooth fabrics are gentle against skin and better for sensitive sleepers, and a machine washable topper is far easier to keep fresh than one that requires spot cleaning only. Check whether the brand offers a satisfaction guarantee and responsive support, which gives you flexibility if the fit is not right. Small bedroom setups can also benefit from coordinating cooling sleep layers with calming ambiance, like the soft glow picks in our dimmable himalayan salt lamps for small bedrooms and quiet background sound from our budget white noise machines for better sleep.
When to Try Something Else / See a Professional
If you consistently wake up sweaty, overheated, or stiff despite a correctly sized cooling topper, the issue may be your mattress itself, your room environment, or an underlying sleep concern rather than topper size. This type of 5 inch memory foam topper is not ideal for sleepers who need a very firm, low profile surface, for cribs or toddler beds that require a very specific safe fit, or for anyone who needs medical grade pressure relief. In those cases, skip this style and consult a sleep specialist or healthcare professional for guidance on the right support and temperature solution for your situation.
Frequently Asked Questions
Should a cooling mattress topper be the same size as your mattress?
Yes, in most cases your cooling mattress topper should be the exact same size as your mattress for full coverage and stable airflow. A matching size prevents overhang that blocks ventilation and avoids gaps that leave parts of the bed warm. If you have a split adjustable bed, match each side separately with the corresponding Twin XL size.
How do I know if a cooling topper will fit my thick mattress?
Check the pocket depth range listed for the topper and compare it to your mattress thickness measured at its highest point. A topper with an 8 to 16 inch skirt, like many Queen options in 2026, will accommodate most standard and pillow top mattresses. If your mattress is outside that range, look for an extra deep pocket version or a topper with adjustable straps.
Can a queen cooling topper fit a full or king bed?
A Queen cooling topper is designed for a 60 by 80 inch Queen mattress and will not fit a Full or King correctly. On a Full it will drape over the sides and bunch, reducing cooling, and on a King it will leave large uncovered warm areas. Always buy the size that matches your mattress label to maintain even cooling and a secure, non slip fit.
Browse more picks in our Sleep & Relaxation category, or see our related guide on Best Weighted Blanket for Hot Sleepers 2026: 10 Cooling Picks Reviewed.
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