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Finding the Best Mattress Topper for Split King Adjustable Beds



Split king adjustable beds have become increasingly popular, allowing couples to customize the positioning and support on each side. Adding a mattress topper provides extra comfort, and support, and protects your mattress. But finding the right mattress topper for a split king adjustable bed can be tricky. This comprehensive guide covers everything you need to know, from finding the ideal size and thickness to materials, specialized options, and top brands to suit your needs and budget.

What is a Split King Adjustable Bed and Why Get a Mattress Topper?

A split king adjustable bed base allows each side to be customized with independent adjustable positions, providing custom back and neck support for co-sleepers. Split king bases make it easy for couples with different preferences to tailor the settings to meet their needs.

Most mattresses that work with adjustable bases are around 10-16 inches thick. Adding a mattress topper for split king adjustable bed offers a number of benefits:

  • Extra comfort: Toppers add a comfort layer that contours to your body shape. This allows you to keep a supportive innerspring or latex mattress while softening it with a plush topper.
  • Support and alignment: Gel, latex, and memory foam toppers provide cushioning yet gently support pressure points like shoulders, hips, and lower back. This aids in proper spinal alignment.
  • Motion isolation: Foam toppers dampen movement from your partner switching positions on the other side of the split king bed so you don’t get woken up.
  • Mattress protection: Toppers act as a protective barrier between your body and the mattress, allowing you to keep your mattress cleaner and extend its lifespan.
  • Affordability: Adding a mattress topper can refresh an old mattress at a fraction of the cost of buying a whole new bed.

How to Choose the Best Mattress Topper for a Split King Adjustable Bed

With different materials, thicknesses, and features available, it can be tricky to decide which mattress topper will work best for your adjustable split king bed. Here are the key factors to consider while shopping:


Since your adjustable base already raises your sleeping surface higher off the floor, low-profile mattress toppers around 2-4 inches are recommended. This provides cushioning without making the bed harder to get into. Thinner toppers are also lighter weight and will move with the base adjustment better than thick versions.


Mattress topper materials determine factors like contouring, responsiveness, temperature regulation, and durability. Common options include:

  • Memory foam: Known for body-cradling comfort, memory foam softens and conforms closely to the sleeper’s shape in response to pressure and warmth. Look for at least 3 inches for ample pressure relief. Downsides can include heat retention.
  • Gel memory foam: With cooling gel infused into the top layer of foam, these regulate temperature better than traditional memory foam. They contour closely while feeling cooler.
  • Latex foam: Derived from the sap of rubber trees, latex contours to the body’s natural curves but has more bounce and responsiveness than memory foam. Natural latex sleeps very cool as well.
  • Feather and down: Luxuriously soft and lightweight, featherbeds offer cloud-like plushness that adjustable beds easily conform around. They allow airflow to keep the surface cooler.
  • Wool: Provides temperature regulation, moisture wicking, and natural fire protection. Wool mattress toppers offer cushioned comfort with antimicrobial properties.

Firmness Level

Pay attention to whether the mattress topper is described as soft, medium, or firm density. Softer, contouring styles work well for side sleepers while medium densities provide more reinforcement for back sleepers using the adjustable function. Personal preference rules here.

Zoned mattress toppers offer ergonomic alignments, with firmer foam reinforcing areas like the lumbar spine and shoulder region while softer foam cushions are areas prone to pressure points like the hips and neck. This zoned construction suits adjustable bases well.

Fit for Adjustable Base

Look for mattress toppers specifically designed for adjustable beds in a split king size. Contouring memory foam that flexes with the base generally works better than stiff, dense types that resist movement. Toppers should have elastic corner straps to keep them secured to the mattress surface as the bed adjusts.

Price Point

  • Budget: Under $150. Basic memory foam and latex options.
  • Mid-range: $150 to $300. Better quality foams and materials. Additional features like gel-infused memory foam or phase change materials for cooling become available.
  • Premium: Over $300. Highest-end memory foams, natural latex with zoning for ergonomic spine alignment, and breathable materials like wool.

Health Factors

Those with acid reflux, back pain, and neck issues can benefit from zoned contouring support. Gel memory foams, latex, and wool aid cooling and ventilation for hot sleepers. Allergy sufferers should look for hypoallergenic and antimicrobial materials.

Top Recommendations

Based on the above criteria, here are top-rated mattress topper options specifically tailored for the unique needs of adjustable base sleepers:

  • Best Memory FoamDreamfoam Bedding 3” Gel Swirl Memory Foam Topper. Cooling gel-infused memory foam with ventilation channels. Fits adjustable bases with elastic corner straps.
  • Best LatexSleep on Latex Pure Green 2″ Natural Latex Topper. Zoned ergonomic support. Responsive natural latex is suitable for adjustable bases.
  • Best FeatherbedPacific Coast Feather Boutique Ultra Soft Goose Down Feather Bed Topper. 5 inches of lofty goose down atop a 233 thread count cotton cover. Breathable and movable.

Where to Shop

You’ll get the best selection of mattress toppers for split king adjustable beds online, especially ones tailored to the flexibility needs of bases that adjust. Direct-to-consumer bedding companies offer more customization. Check policies on trial periods and warranties.

What Size Mattress Topper Fits a Split King Adjustable Bed?

Since you are outfitting a split adjustable base where each side operates independently, you need two twin XL mattress toppers to cover each half of the split king bed.


Twin XL mattress dimensions are:

  • Length: 80 inches
  • Width: 38 inches

So you’ll need a set of these for both sides of the split king base. Ensure any topper you select comes in Twin XL sizing.

Finding the Right Thickness

Low-profile mattress toppers around 2-4 inches allow plenty of cushioning without making the bed too high to easily get into. Lean towards the thinner 2-3” height unless you specifically want a plusher feel.

Allowing Room for Adjustment

Make sure to get deep pocket fitted sheets long enough to accommodate the mattress thickness when raised into an upright or lifted position. This ensures the topper stays secured to the mattress surface.

Consider using:

  • Fitted sheets with elastic straps or foam rails to keep the topper firmly in place when adjusting
  • Breathable, stretchy covers over your mattress topper to prevent shifting

How to Choose Firmness Level for Comfort and Support

Adjustable beds allow custom positioning for reading, watching TV, and zero gravity relaxation. The mattress firmness impacts the comfort level in these inclined positions. Finding the right balance of cushioning softness with adequate support is key.

Guidance Based on Sleep Position

  • Side sleepers often prefer a softer mattress and topper to cradle shoulders and hips, keeping the spine aligned. Soft, plush memory foam or down featherbeds provide pressure relief.
  • Back sleepers require more reinforced support for the mid and lower back to keep the spine properly aligned in flat or inclined positions. Medium-density foam or mildly firm latex offer cushioned firmness. If too soft, the midsection can dip down uncomfortably.

Soft vs. Medium vs. Firm Density

Mattress topper density impacts the balance of contouring softness and support. This guides firmness ratings:

  • Soft: Less dense foam and down toppers allow more sinking in. Better pressure relief for side and combo sleepers.
  • Medium: Mid-range density with some contouring. Combination and back sleepers like moderate firmness levels.
  • Firm: Dense, supportive foam maintains structure keeping the spine aligned as incline changes. Best for back sleepers to avoid sinks.

Assess your preferences: do you prefer to sleep “in” your bed with deeper cradling or “on” your mattress with reinforced firmness keeping you lifted up? This helps determine the ideal topper’s softness.

Zoned Support

Ergonomically zoned mattress toppers tune firmness to anatomy offering reinforced lumbar support while shoulder and neck zones remain plush. This precision aligns the spine, whether reclined or flat. Helpful for those prone to back and neck aches.

Specialized Options for Neck Pain and Back Pain

Adjustable bases aim to alleviate back pain and tension. But if you still wake with aches and soreness, a tailored mattress topper can help ease discomfort. Those with chronic neck, shoulder and back pain should consider:

Memory Foam Eases Back Pain

Body-conforming memory foam mattress toppers provide enveloping comfort, especially beneficial for lower back pain. Heat-responsive memory foam softly fills space beneath the arched lumbar region preventing distortion and relaxing connective tissue. Shoulders and hips sink in just enough to align the spine and relieve pressure points.

Latex Gently Lifts Neck Pain

For upper back tension and neck pain when reclining, zoned latex foam toppers offer responsive support. Dense latex lifts the shoulder and neck area without resistance, while softer latex cushions. This floating, weightless sensation eases instead of overarches the cervical spine to relax neck muscles.

Zoned Alignment Aids Back and Neck Pain

Ergonomically zoned mattress toppers tune firmness to anatomy reinforcing the lumbar spine for back sleepers, while keeping shoulder zones plush to prevent neck torquing for side sleepers. This precision alignment helps back and neck pain sufferers wake refreshed.

Allergy-Friendly Mattress Toppers

For those sensitive to allergens like dust mites and mold, the right hypoallergenic mattress topper keeps your bed in a sneeze-free zone.

Encasings Prevent Allergens

Protective mattress encasings are form fitted barriers that fully seal all six sides of the mattress. This blocks dust mites, pet dander, pollen, and other microscopic allergens from colonizing inside the mattress where they’re difficult to remove. It also prevents moisture build-up that molds thrive on. Adding an encasement beneath your topper shields you.

Organic Materials Like Latex and Wool

Natural materials like organic latex foam derived from rubber trees or wool mattress toppers provide hypoallergenic cushioning stopping allergens from invading your bed. Their antimicrobial and moisture-wicking abilities keep airways clear. Wool’s natural lanolin makes it resistant to mold, mildew, and bacteria growth as well.

Caring for Your Mattress Topper

To extend your topper’s comfort and support lifespan, proper care is key. Follow these tips:

Cleanliness: Protect your topper with a fitted sheet and wash it regularly according to material guidelines. Spot clean stains quickly by blotting gently with a mild detergent and cold water. Foam and latex can be spot-treated with enzymatic cleaners.

Allow airflow: Since foam retains heat, letting your topper air out between sleeping allows moisture to dissipate so heat and smells don’t build up.

Damage prevention: Don’t bend or tightly fold foam toppers as this can break down materials. Carefully lift memory foam instead of dragging to avoid tearing. Store flat if removing.

Secure positioning: Use a topper designed to move with adjustable bases, preferably one with corner straps or a non-slip bottom. Make sure your fitted sheet has enough give for incline positioning without tugging at the topper edges.

Top Mattress Topper Brands For Adjustable Beds

These leading mattress brands offer quality mattress toppers tailored for the flexibility of adjustable bases:


  • Specializes in proprietary NASA-developed memory foams perfect for adjustable bases
  • Features mobile mattress toppers with elasticized, stretch-fitting skirts
  • Phase change material regulates temperature

Sleep Number

  • Personalized comfort, firmness, and support for adjustable bases
  • Utilizes air chambers over firmness zones to contour to adjustable positions
  • Breathable fabrics aid in ventilation


  • Gel-infused memory foams provide cooling, pressure-relieving luxury
  • Zoned latex options align the spine with firm and soft areas
  • Rayon bamboo covers wick moisture and allow airflow

Reputable brands stand behind their materials, manufacturing standards, and quality with guarantees. Be sure to check adjustable base compatibility, sleep trials, and long-term warranties protecting against impressions and defects.

Mattress Topper vs. Mattress Pad vs. Comforter

What sets a mattress topper apart from mattress pads and other bedding accessories? Here’s an overview:

Mattress Toppers

  • Thicker cushioning layer (minimum 2 inches)
  • Transforms a too-firm mattress for sleep comfort
  • Made of memory foam, down, wool, and latex materials
  • Pressure relief and ergonomic support
  • Secured beneath sheets

Mattress Pads

  • Thin padding just 1/4″ – 1″ thick
  • Primarily protects the mattress from spills
  • Made of thinner flexible polyester fill
  • Easy to wash and inexpensive
  • Secured beneath fitted sheets

Comforters/Duvet Inserts

  • Designed as a decorative top blanket layer
  • Fluffier with baffle boxes to prevent fill shifting
  • Removable as bedding top layer
  • Supplemental warmth without sleep surface cushioning
  • Placed on top of a flat sheet

If your goal is to soften a too-firm mattress or provide customized zoned support, a mattress topper is the way to go. For just a little padding or decorative finish, opt for a mattress pad or comforter instead.

Frequently Asked Questions

What thickness mattress topper should I get?

For adjustable bases, between 2-4 inches provides adequate cushioning without becoming overly thick. Toppers also come in “low profile” versions tailored to adjustable beds.

What size do I need for a split king adjustable bed?

You’ll need two separate twin XL-size mattress toppers for the split adjustable base. Ensure the length and width dimensions match up.

How do I keep my mattress topper from shifting on an adjustable base bed?

Look for toppers made specifically for adjustable bases – preferably with elastic corner straps or skirting to secure it in place. Using a fitted sheet with very deep pockets can also prevent bunching.

Is a mattress topper hot for adjustable beds?

Gel-infused memory foam, latex, wool, and other breathable materials regulate comfort and airflow better than traditional memory foam. The zoned design also encourages ventilation through cut-out channels.

Can you clean memory foam toppers?

Spot clean only. Use an enzymatic cleaner formulated for memory foam rather than harsh detergents. Allow your topper to fully air dry before reinstalling. A protective cover helps minimize cleaning needs.


Whether seeking zoned orthopedic support, cooling relief for night sweats, or the comfort of a too-firm mattress, a mattress topper can transform your adjustable bed. Tailor your topper to the special requirements of a split king base with an appropriate twin XL size and mobile materials suitable for adjusting positions. Prioritize breathable, hypoallergenic materials for clean comfort. Then enjoy custom comfort you can tweak on each side.

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