- 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 2026 brochure, 2026.
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Sleep Foundation: Best Mattress Overall Read review
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The Arcadia bedroom. Measure the platform, not the old mattress, before you buy.

Keystone's 2026 24SRE floorplan.
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2025 | Arcadia Select 24SRE | 29 ft 5 in | 4 |
| 2026 | Arcadia Select 24SRE | 28 ft 10 in | 6 |
The main bed is 60 × 80 in (Keystone 2026 brochure, 2026).