- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
Sleep Foundation: Best Mattress Overall Read review
That's the same size as a regular queen, so any standard queen mattress fits.
About the RV queen size →Keystone 2018 brochure, 2018.
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Sleep Foundation: Best Mattress Overall Read review
Sleep Foundation: Best Mattress for Temperature Regulation Read review
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Some bunks have a rounded corner, so trace yours before a custom cut. A thicker bunk mattress takes headroom from the bunk above.
Sleep Foundation: Best Mattress for Pressure Relief Read review

The Sprinter bedroom. Measure the platform, not the old mattress, before you buy.
| Year | Main bed | Bunks | Other beds | Source |
|---|---|---|---|---|
| 2017 | – | 36 × 74 in | – | Keystone spec sheet |
| 2018 | 60 × 80 in Full | – | – | Keystone 2018 brochure |
Years not listed weren't published.

Keystone's 2017 325BMK floorplan.
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2017 | Sprinter Wide Body 325BMK | 36' 11" | – |
The main bed is 60 × 80 in (Keystone 2018 brochure, 2018).
36 × 74 in (Keystone spec sheet, 2017).