The 2025 Juniper refresh added a rear screen and, by TESMAT's figures, changed the folded-seat angle (about 13°, up from about 8°). These are the mattresses whose makers state a Juniper fit, and one where you should check the fit list first.
The Snuuzu Model Y has the top score of those with a stated Juniper fit: Snuuzu says its Model Y mattress is compatible with all Model Y versions, including the 2025 Juniper. NovaPads Air-Foam Pro is the Best affordable pick, with a Juniper fit stated by NovaPads. It has ventilation grooves, not a rear-screen cutout. Havnby FlatCore, DreamCase (Juniper version), Yeslak and T-Launch also state a Juniper fit. TAPTES says its pad is not for the Juniper, and Aerogogo does not claim a Juniper fit.
Snuuzu says its Model Y mattress is compatible with all Model Y versions, including the 2025 Juniper; it does not name the six-seat Model Y L. Comfort foam over a pressurised air layer, with a built-in USB-C pump. It is the most expensive option here and has no sleep trial. TCG10 is issued by Snuuzu for TeslaCampingGuide readers, and TeslaCampingGuide may earn a commission when it is used.
NovaPads states a Juniper fit: air and foam combined, a built-in 12V pump, and ventilation grooves on top rather than a rear-screen cutout. Its own FAQ says about 6-7° of slope remains.
Tesla's own Model Y mattress: self-inflating foam with an external pump. For a Juniper, check Tesla's fit list before you buy. Tesla's US page excludes the six-seat Model Y L. Out of stock in all five Tesla stores checked on 1 Oct.