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5.5″ Kingship Comfort Basic Mattress
Best for: Thin RV and odd shapes
A 5.5″ foam mattress in narrow twin, three-quarter and RV sizes, with custom shapes such as angled corners.
Good to know: Firmness isn't stated.
- Type
- Foam
- Height
- 5.5″
- Sizes
- Made to order + custom
- Certified
- CertiPUR-US
60 × 75 in · 5.5″ tall
Where to get it
- restrightmattress.comQueen $450 (sale, was $750) · checked Oct 18 Get a quote
Returns: None. Details
We may earn a commission if you buy. Check the price for your exact size and height on the seller’s site.
The short version
Worth a look if
- Thin RV and odd shapes
Good
- A 5.5″ foam mattress in narrow twin, three-quarter and RV sizes, with custom shapes such as angled corners.
- Trial: None. All mattress sales final; no returns or cancellation once shipped
- Height: 5.5″
- Sizes: Narrow Twin (29 × 72), Three Quarter (48 × 70), Narrow Twin (30 × 72), Narrow Twin (30 × 75), Narrow Twin (30 × 80), Full, Full XL (54 × 80), Three Quarter (54 × 72), Three Quarter (42 × 72), Three Quarter (48 × 72), Queen, RV Short Queen (60 × 75), RV King (72 × 75), RV King (72 × 80)
Think about
- Firmness isn't stated.
- No owner reviews we could verify yet
Based on the maker’s published specs and terms, and the owner reviews linked below. We haven’t slept on it. Something wrong? Tell us.
What owners say
No owner reviews we can verify yet A small set of real reviews, each linked to its source. Not a star rating.
No independent owner reviews were found for this model.
What people liked
No supported praise summary in the sample.
What to weigh up
No substantive concern verified in this small sample. This is a gap in the evidence, not proof of no drawbacks.
Sources & sample limits
none found Sample: 0 owner reports.
Searched Reddit, Trustpilot (no page for restrightmattress.com) and GoodBed; nothing on Rest Right or Kingship Comfort. Reviews on restrightmattress.com product pages are brand-hosted.
Research checked October 14, 2026. These are sourced observations, not our own product tests or a star rating.
Every size it comes in
Short queen60 × 75 in5.5″RV king72 × 80 in5.5″Short king72 × 75 in5.5″RV bunk / narrow twin30 × 75 in5.5″RV bunk (30 × 80)30 × 80 in5.5″Full XL · 54-inch54 × 80 in5.5″Narrow Twin (29 × 72)29 × 72 inAs listedThree Quarter (48 × 70)48 × 70 inAs listedNarrow Twin (30 × 72)30 × 72 inAs listedThree Quarter (54 × 72)54 × 72 inAs listedThree Quarter (42 × 72)42 × 72 inAs listedThree Quarter (48 × 72)48 × 72 inAs listed
Taken from the maker’s size options, in the inches it publishes. Tap a size to compare every mattress made in it. Sizes marked “as listed” don’t exactly match a standard size, so check your frame.
Price for every size
From the maker’s site on Oct 24, 2026. Prices change often, so check before you buy.
| Size | Inches | Price | |
|---|---|---|---|
| Narrow Twin (29" x 72") | 29 × 72 | $375 sale | See it |
| Narrow Twin (30" x 72") | 30 × 72 | $375 sale | See it |
| Narrow Twin (30" x 75") | 30 × 75 | $375 sale | See it |
| Narrow Twin (30" x 80") | 30 × 80 | $375 sale | See it |
| Three Quarter (42" x 72") | 42 × 72 | $450 sale | See it |
| Three Quarter (48" x 70") | 48 × 70 | $450 sale | See it |
| Three Quarter (48" x 72") | 48 × 72 | $450 sale | See it |
| Three Quarter (54" x 72") | 54 × 72 | $450 sale | See it |
| Full | 54 × 75 | $450 sale | See it |
| Full XL (54" x 80") | 54 × 80 | $450 sale | See it |
| RV Short Queen (60" x 75") | 60 × 75 | $450 sale | See it |
| Queen | 60 × 80 | $450 sale | See it |
| RV King (72" x 75") | 72 × 75 | $500 sale | See it |
| RV King (72" x 80") | 72 × 80 | $500 sale | See it |
How it compares
Beside the most similar mattresses from other brands.
| 5.5″ Kingship Comfort Basic MattressRest Right Mattress | Elation (6″ Gel Memory Foam)Mattress Insider | Sedona (5.5″ Firm Foam)Mattress Insider | The DozyCustomMattress.com | |
|---|---|---|---|---|
| Type | Foam | Memory foam | Foam | Memory foam |
| Queen price | $450 | $459 | $361 | $599 |
| Height | 5.5″ | 6″ | 5.5″ | 5″ or 6″ or 7″ or 8″ or 9″ or 10″ or 11″ or 12″ |
| Trial | See terms | 365 nights | 121 nights | See terms |
| Odd sizes | 6 | 18 | 18 | 10 |
| Expert reviews | None yet | None yet | None yet | None yet |
What’s inside
- 1Gray 8-way stretch cover
- 2Comfort Support Foam (5.5″ total)
- Feel
- Not published
- Height
- 5.5″
- Custom sizes
- Yes, the maker builds to your measurements
Complete the bed
Odd sizes need everything else in the same inches. Here’s what we have for this mattress’s odd sizes.
Short queen · 60 × 75
RV king · 72 × 80
Short king · 72 × 75
RV bunk / narrow twin · 30 × 75
RV bunk (30 × 80) · 30 × 80
Full XL · 54-inch · 54 × 80
Returns and ordering
Trial and returns
None. All mattress sales final; no returns or cancellation once shipped
Before you order
- Measure inside the frame, not the old mattress
- Check clearance above for the height you pick
- Make sure your base supports it
- Buy sheets in the same exact size
Questions
What is it made of?
Thin 5.5″ foam mattress of Comfort Support Foam under a gray 8-way stretch cover, aimed at RVs and odd shapes; custom sizing is offered for angled-corner or odd-shaped RV beds. Made in the USA.
How firm is it?
Not published That’s the maker’s description; we haven’t measured it.
Which sizes and heights can I get?
12 sizes, 5.5″. See every size. Confirm your exact size and height with the seller.
Are the reviews about this exact mattress?
No owner reviews we can verify yet. Searched Reddit, Trustpilot (no page for restrightmattress.com) and GoodBed; nothing on Rest Right or Kingship Comfort. Reviews on restrightmattress.com product pages are brand-hosted.
Where did this information come from?
Checked 2026-10-18. Specs and terms can change.
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