Mattresses
Low-Profile Mattresses for Bunk Beds, Loft Beds and Trundles
The right mattress has to match more than the bed size. For a bunk bed, loft bed or trundle, mattress height affects guardrail clearance, sleeping space and whether the mattress fits the frame as intended. Start with the mattress size and maximum thickness listed on your bed’s product page, label or instructions, then choose a mattress at or below that limit.
Shop 5-, 6-, 8- and 10-inch low-profile mattresses in Twin, Twin XL, Full, Queen and selected King sizes, plus deeper mattresses for compatible standard beds. Many of our bunk and loft bed pages already list recommended mattress thickness and matching mattress options.
- Match the sizeTwin, Twin XL, Full, Full XL, Queen and King are not interchangeable.
- Check the height limitNever exceed the bed manufacturer’s maximum recommended mattress thickness.
- Check each sleep surfaceTop, bottom and trundle positions can have different mattress requirements.
- Use the exact matchesLook for recommended mattresses on the bed product page or ask our furniture team.
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Sale
8 Inch Max Queen Size Memory Foam Mattress
Was: $980.00Now: $785.00Max Queen Size Memory Foam Mattress Our Max Queen Size Memory Foam Mattress features a top layer of gel infused cooling foam to keep you cool while still offering plush comfort. It is perforated to...Was: $980.00Now: $785.00 -
Sale
8 Inch James Bunk Bed Mattress
Was: $285.00 - $415.00Now: $229.00 - $329.00FREE SHIPPING TODAY! Our James Bunk Bed Mattress offers a comfortable cooling mattress solution at an affordable price. The 2” top layer of gel infused memory foam features ventilation holes which...Was: $285.00 - $415.00Now: $229.00 - $329.00 -
Sale
5 Inch Max Memory Foam Twin XL Mattress
Was: $495.00Now: $395.00Max Memory Foam Twin XL Mattress Our Max Memory Foam Twin XL Mattress features a top layer of gel infused cooling foam to keep you cool while still offering plush comfort. It is perforated to promote...Was: $495.00Now: $395.00 -
Sale
6 Inch Knox Twin Memory Foam Trundle Mattress
Was: $250.00Now: $199.00FREE SHIPPING TODAY! Our newly upgraded Knox Memory Foam Trundle Mattress offers an affordable and comfortable mattress solution. It features a 1.5” top layer of gel infused memory foam with...Was: $250.00Now: $199.00 -
Sale
8 Inch Bryant Memory Foam Twin XL Mattress
Was: $250.00Now: $199.00FREE SHIPPING TODAY! Our new Bryant Memory Foam Twin XL Mattress offers a comfortable cooling mattress solution at an affordable price. The 2” top layer of gel infused memory foam features...Was: $250.00Now: $199.00 -
Sale
6 Inch Knox Memory Foam Full Mattress
Was: $315.00Now: $249.00FREE SHIPPING TODAY! Our newly upgraded Knox Memory Foam Full Mattress offers an affordable and comfortable mattress solution. It features a 1.5” top layer of gel infused memory foam with ventilation...Was: $315.00Now: $249.00 -
Sale
6 Inch Knox Memory Foam Twin Mattress
Was: $250.00Now: $199.00FREE SHIPPING TODAY! Our newly upgraded Knox Memory Foam Twin Mattress offers an affordable and comfortable mattress solution. It features a 1.5” top layer of gel infused memory foam with ventilation...Was: $250.00Now: $199.00 -
Sale
8 Inch Rex Full Size Memory Foam Mattress
Was: $595.00Now: $475.00Rex Full Size Memory Foam Mattress Our Rex Full Size Memory Foam Mattress is a great loft or bunk bed mattress and can also be used on our standard full size beds as well. It features a high density...Was: $595.00Now: $475.00 -
Sale
5 Inch Max Full Size Memory Foam Mattress
Was: $620.00Now: $495.00Max Full Size Memory Foam Mattress Our Max Full Size Memory Foam Mattress features a top layer of gel infused cooling foam to keep you cool while still offering plush comfort. It is perforated to...Was: $620.00Now: $495.00 -
Sale
8 Inch Rex Twin XL Memory Foam Mattress
Was: $530.00Now: $425.00Rex Twin XL Memory Foam Mattress Our Rex Twin XL Memory Foam Mattress is a great loft or bunk bed mattress and can also be used on our standard twin xl beds as well. It features a high density foam...Was: $530.00Now: $425.00 -
Sale
6 Inch Knox Memory Foam Queen Mattress
Was: $375.00Now: $299.00FREE SHIPPING TODAY! Our newly upgraded Knox Memory Foam Queen Mattress offers an affordable and comfortable mattress solution. It features a 1.5” top layer of gel infused memory foam with...Was: $375.00Now: $299.00 -
Sale
8 Inch Rex Twin Memory Foam Mattress
Was: $495.00Now: $395.00Rex Twin Memory Foam Mattress Our Rex Twin Memory Foam Mattress is a great loft or bunk bed mattress and can also be used on our standard twin size beds as well. It features a high density foam base...Was: $495.00Now: $395.00
How to Choose the Right Mattress for a Bunk Bed or Loft Bed
Mattress size tells you the required length and width. Mattress height—also called thickness, depth or profile—tells you how tall the mattress is. Both measurements matter on bunk beds, loft beds, daybeds and trundles. A mattress can have the correct width and length but still be too thick for the bed’s guardrails or available clearance.
Low-Profile Mattress Height Guide
| Mattress height | When to consider it | Sizes currently offered | Starting points |
|---|---|---|---|
| 5 inches | Very low-profile applications where guardrail or trundle clearance is tight. Confirm the bed’s exact size and minimum support requirements. | Twin, Twin XL and Full | Max Twin, Max Twin XL and Max Full |
| 6 inches | A common low-profile choice for compatible bunks and lofts, with dedicated trundle and futon options also available. | Twin, Twin XL, Full, Queen and King; selected trundle and futon sizes | Knox Twin, Morgan Twin XL, Knox Full and Knox Trundle |
| 8 inches | Use when the bed allows an 8-inch mattress. Always check whether the top and bottom bunks have different limits. | Twin, Twin XL, Full and Queen | James Bunk Bed Mattress, Bryant Twin XL and the Rex collection |
| 10 inches | For beds whose instructions permit a 10-inch profile. Do not assume it is suitable for an upper bunk. | Twin, Full, Queen and King | Oliver Memory Foam Mattress |
| 12 to 15 inches | Deeper mattresses for compatible standard beds. Use on a bunk or loft only when that exact profile is permitted by the bed manufacturer. | Twin through California King, depending on the model | 12 Inch Chime Elite 2.0 and 15 Inch Luxe 2.0 Plush |
Mattress Size Guide
These are common U.S. mattress dimensions. Individual products can vary slightly, so compare the dimensions on both the bed and mattress product pages before ordering.
| Size | Common width | Common length | Fit note |
|---|---|---|---|
| Twin | About 38 to 39 inches | About 75 inches | Common on kids’ bunks, lofts, daybeds and trundles. |
| Twin XL | About 38 to 39 inches | About 80 inches | Five inches longer than a standard Twin; the two are not interchangeable. |
| Full | About 53 to 54 inches | About 75 inches | Also called Double. Common on Full lofts and the lower level of Twin-over-Full bunks. |
| Full XL | About 53 to 54 inches | About 80 inches | Five inches longer than Full; use only with a Full XL frame. |
| Queen | About 60 inches | About 80 inches | Used on selected Queen lofts and Queen bunk configurations. |
| King | About 76 inches | About 80 inches | Primarily for compatible standard beds. |
| California King | About 72 inches | About 84 inches | Narrower and longer than standard King; the two are not interchangeable. |
Bunk, Loft and Trundle Mattress Fit Checklist
1. Start with the bed
Open the bed product page, label or assembly instructions. Record the required mattress size and the maximum mattress thickness for every sleep surface.
2. Treat each position separately
The top bunk, bottom bunk and trundle may use different sizes or height limits. A mattress that fits the lower bed may be too thick for the upper bunk.
3. Confirm the support system
Check whether slats, a bunkie board or another foundation is included or required. Do not add a box spring unless the bed manufacturer calls for one.
4. Compare exact dimensions
Review the mattress width, length and height instead of relying only on the size name. For a trundle, also confirm clearance beneath the main bed.
Common Mattress Fit Questions
What mattress height should I use on a bunk bed?
Use the maximum thickness stated by the bed manufacturer and choose a mattress at or below it. Many beds in our catalog list separate top- and bottom-bunk recommendations.
Can I use a 10-inch mattress on the top bunk?
Only if the bed’s product information, label or instructions permit that thickness. A mattress that is too tall reduces the amount of guardrail above the sleeping surface.
Do the top and bottom bunk need the same mattress?
Not always. Bunk configurations can use different sizes and different maximum heights. Match each position independently.
What mattress works in a trundle?
Match the trundle’s specified width, length and maximum depth. A standard-height mattress may prevent the trundle from closing beneath the bed.
Are Twin and Twin XL mattresses interchangeable?
No. They are commonly similar in width, but Twin XL is about five inches longer. Match the frame’s stated size.
Does a bunk bed need a box spring?
Many bunk and loft beds use built-in mattress supports and do not need a box spring. Follow the support requirements on the specific bed page or instructions.
