Top pick
HelixHelix Midnight
- Hybrid
- 11.5 in thick
- Medium Feel
Sleep Foundation: Best Mattress for Side Sleepers Read review
$799Twin · list priceSee price
Thor Quantum LZ25 mattress size
Main bed38 × 75 inCustom size
RV mattress sellers stock this exact size, or order a custom size cut to your platform.
Thor spec sheet, 2026.
Bunks52 × 96 in
Bunk. Thor spec sheet, 2026.
Common RV bunk sizes →
Mattresses in 38 × 75 in
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Best value
Mattress InsiderThe Sedona
- All-foam
- 5.5 in thick
- Firm
$25938" x 75" · list priceSee price
Reviewers' favorite
Mattress InsiderPark Meadow Encased Coil II
- Hybrid
- 8 in thick
- cushion-firm
Sleep Foundation: Best Mattress for Pressure Relief Read review
$49938" x 75" · list priceSee price
Best memory foam
Mattress InsiderElation Gel Foam
- Memory foam
- 6 in thick
- cushion firm
$40938" x 75" · list priceSee price
Best hybrid
HelixHelix Dawn
- Hybrid
- 11.5 in thick
- Firm
$749Twin · list priceSee price
Custom size
Mattress InsiderLuxury Gel Memory Foam
- Memory foam
- 8 in thick
- not stated
Made to 38 × 75 inGet a quote
Bunk mattresses in 52 × 96 in
Some bunks have a rounded corner, so trace yours before a custom cut. A thicker bunk mattress takes headroom from the bunk above.
Custom size
Mattress InsiderPark Meadow Encased Coil II
- Hybrid
- 8 in thick
- cushion-firm
Sleep Foundation: Best Mattress for Pressure Relief Read review
Made to 52 × 96 inGet a quote
Bed sizes by year
| Year | Main bed | Bunks | Other beds | Source |
|---|---|---|---|---|
| 2025 | 38 × 75 in Twin | 52 × 96 in | – | Thor spec sheet |
| 2026 | 38 × 75 in Twin | 52 × 96 in | – | Thor spec sheet |
Years not listed weren't published.
The LZ25 floorplan
Thor's 2027 LZ25 floorplan.
Is this your LZ25?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2025 | Quantum LZ25 | – | – |
| 2026 | Quantum LZ25 | – | – |
| 2027 | Quantum LZ25 | 26'-5" | 4 |
Other Quantum mattress sizes
Sources
- Thor (media-center.thormotorcoach.com): https://media-center.thormotorcoach.com/m/7862dac75d169fcf/original/Z64ALJbqstJ9-lIS_2025-TS-Quantum-021225-pdf.pdf
- Thor (media-center.thormotorcoach.com): https://media-center.thormotorcoach.com/m/79058c180a7dd728/original/aM1xcJ5xUNkB06Ym_2026-OH-Quantum-pdf.pdf
- Thor (thormotorcoach.com): https://www.thormotorcoach.com/quantum/floor-plans/lz25
Questions
What size mattress is in the Thor Quantum LZ25?
The main bed is 38 × 75 in (Thor spec sheet, 2026).
What size are the Thor Quantum LZ25 bunk mattresses?
52 × 96 in (Thor spec sheet, 2026).