Great all around
RVMattress.comSignature Hybrid
- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
Sleep Foundation: Best Mattress Overall Read review
$1,865RV King - 72x80 · list priceSee price
Thor Aria 3901 mattress size
Main bed72 × 80 inRV king
That's an RV king, 4 in narrower than a regular king (76 × 80 in). A regular king won't fit, so get an RV king in exactly 72 × 80 in.
About the RV king size →Thor spec sheet, 2026.
Bunks48 × 74 in
Bunk. Thor spec sheet, 2026.
Common RV bunk sizes →
Mattresses in 72 × 80 in
We may earn a commission when you buy through some of these links. It doesn't change which mattresses we list.
Best value
RVMattress.comCopperFlex Essential
- All-foam
- 6 in thick
- five comfort options
$799RV King - 72x80 · list priceSee price
Firm
RVMattress.comPlank Firm
- All-foam
- 10 in thick
- Firm / Extra Firm
Mattress Clarity: Best RV Mattress for Heavy People Read review
$1,532RV King - 72x80 · list priceSee price
Cooling
RVMattress.comAurora Luxe Cooling
- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
Sleep Foundation: Best Mattress for Temperature Regulation Read review
$2,465RV King - 72x80 · list priceSee price
Heavy duty
RVMattress.comTitan Plus Luxe
- Hybrid
- 13 in thick
- Plush
$1,865RV King - 72x80 · list priceSee price
Helix pick
HelixHelix Midnight
- Hybrid
- 11.5 in thick
- Medium Feel
Sleep Foundation: Best Mattress for Side Sleepers Read review
$1,489RV King · list priceSee price
RV hybrid
RVMattress.comCopperFlex RV Hybrid
- Hybrid
- 10 in thick
- Medium-Firm
$1,065RV King 72x80 · list priceSee price
Custom size
Mattress InsiderLuxury Gel Memory Foam
- Memory foam
- 8 in thick
- not stated
Made to 72 × 80 inGet a quote
Bunk mattresses in 48 × 74 in
Some bunks have a rounded corner, so trace yours before a custom cut. A thicker bunk mattress takes headroom from the bunk above.
Great all around
RVMattress.comSignature Hybrid
- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
Sleep Foundation: Best Mattress Overall Read review
$1,332Short Full - 48x74 · list priceSee price
Best value
RVMattress.comCopperFlex Essential
- All-foam
- 6 in thick
- five comfort options
$492Short Full - 48x74 · list priceSee price
Firm
RVMattress.comPlank Firm
- All-foam
- 10 in thick
- Firm / Extra Firm
Mattress Clarity: Best RV Mattress for Heavy People Read review
$999Short Full - 48x74 · list priceSee price
Cooling
RVMattress.comAurora Luxe Cooling
- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
Sleep Foundation: Best Mattress for Temperature Regulation Read review
$1,799Short Full - 48x74 · list priceSee price
Bed sizes by year
| Year | Main bed | Bunks | Other beds | Source |
|---|---|---|---|---|
| 2020 | 72 × 80 in King | 48 × 76 in | – | Thor spec sheet |
| 2021 | 72 × 80 in King | 48 × 74 in | – | Thor spec sheet |
| 2022 | 72 × 80 in King | 48 × 74 in | – | Thor spec sheet |
| 2023 | 72 × 80 in King | 48 × 74 in | – | Thor spec sheet |
| 2024 | 72 × 80 in King | 48 × 74 in | – | Thor spec sheet |
| 2025 | 72 × 80 in King | 48 × 74 in | – | Thor spec sheet |
| 2026 | 72 × 80 in King | 48 × 74 in | – | Thor spec sheet |
Years not listed weren't published.
The 3901 floorplan
Thor's 2027 3901 floorplan.
Is this your 3901?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2020 | Aria 3901 | 39'-11" | – |
| 2021 | Aria 3901 | 40'-1" | – |
| 2022 | Aria 3901 | 40'-1" | – |
| 2023 | Aria 3901 | 40'-1" | – |
| 2024 | Aria 3901 | 39'-11" | – |
| 2025 | Aria 3901 | 39'-11" | – |
| 2026 | Aria 3901 | 39'-11" | – |
| 2027 | Aria 3901 | 39'-11" | 6 |
Other Aria mattress sizes
Sources
- Thor (media-center.thormotorcoach.com): https://media-center.thormotorcoach.com/m/289d7d33ab47dfe1/original/9cc501f5-c56e-453b-b40e-0507ed3c0fb9_2020-aria-digital-brochure-oh-spreads-pdf.pdf
- Thor (media-center.thormotorcoach.com): https://media-center.thormotorcoach.com/m/64c16ffe245fb829/original/dba82b97-44f8-45b1-98e1-41d81f67d016_2021-oh-aria-web-pdf.pdf
- Thor (media-center.thormotorcoach.com): https://media-center.thormotorcoach.com/m/5429071376ffbc39/original/87d0f622-78cd-46ce-b74c-b117ee4e7dc5_2022-OH-Aria-pdf.pdf
- Thor (media-center.thormotorcoach.com): https://media-center.thormotorcoach.com/m/26f496dd1b7a2571/original/9e0d5b0c-6571-4df5-b258-68450abb8551_2023-OH-Aria-pdf.pdf
- Thor (media-center.thormotorcoach.com): https://media-center.thormotorcoach.com/m/23c278ea7cb5f0f9/original/8f39cdab-fd88-4116-9aa6-912444c50291_2024-OH-Aria-pdf.pdf
- Thor (media-center.thormotorcoach.com): https://media-center.thormotorcoach.com/m/2e3e1e6a7d757dc9/original/ZunhkrVsGrYSve66_2025-OH-Aria-pdf.pdf
- Thor (media-center.thormotorcoach.com): https://media-center.thormotorcoach.com/m/8c19148126fbe74/original/aNGonZ5xUNkB0_R0_2026-OH-Aria-pdf.pdf
- Thor (thormotorcoach.com): https://www.thormotorcoach.com/aria/floor-plans/3901
Questions
What size mattress is in the Thor Aria 3901?
The main bed is 72 × 80 in (Thor spec sheet, 2026).
What size are the Thor Aria 3901 bunk mattresses?
48 × 74 in (Thor spec sheet, 2026).