--- title: "Havnby vs Lost Horizon Tesla Mattress: Model Y Compared" canonical: "https://teslamattress.com/vs/havnby-vs-lost-horizon" markdown_url: "https://teslamattress.com/vs/havnby-vs-lost-horizon.md" language: "en" author: "Fredrik Mastouri" checked: "not-provided" content_updated: "2026-10-01" evidence_scope: "editorial-summary-not-directly-cited" source_scope: "visible page heading, answer and main content" --- Model Y leveling vs foam-and-air value # Havnby vs Lost Horizon: shaped Model Y support or a thinner R-13 mattress? Havnby lists the FlatCore at $549 with a shaped 7.5-inch profile for the Model Y. Lost Horizon sells a thinner 4.5-inch foam-and-air mattress with an R-13 seller claim. On 1 October 2026, the Lost Horizon store listed its Model Y options at $199.99 and $229.99 and marked both unavailable. By [Fredrik Mastouri](/about) Updated 1 Oct 2026 9 min read Havnby FlatCore Air-foam hybrid **List price** $549 Checked 29 Sep 2026 **Our rating** **83** Our rating is the editors’ judgement, not a measurement. It draws on the operator’s use of a Snuuzu Model Y since 2025 and of a Havnby FlatCore, and on published specs, prices and fit. We earn a commission from Snuuzu and Havnby links. Evidence: owner video and public sources. No lab test. [Full review of Havnby FlatCore](/reviews/havnby-autolevel) Lost Horizon Standard Foam + air **List price** Check seller No dated price on file **Our rating** **74** Our rating is the editors’ judgement, not a measurement. It draws on the operator’s use of a Snuuzu Model Y since 2025 and of a Havnby FlatCore, and on published specs, prices and fit. We earn a commission from Snuuzu and Havnby links. Evidence: seller specifications checked. No lab test. [Full review of Lost Horizon Standard](/reviews/lost-horizon-tesla-mattress) This comparison uses seller specifications and attributed public sources. We have not completed a matched hands-on test of both products. Our rating is the editors’ judgement, not a sleep test. [How we rate](/methodology#rating) Quick verdict ## FlatCore has the shaped profile, the trial and a 2025–2026 variant. Lost Horizon has the published R-value. Choose the Havnby FlatCore when the folded-seat slope is your main problem, when you drive a 2025–2026 Model Y, or when you want a 60-day trial. Choose Lost Horizon when a lower cabin profile and a published R-13 figure matter more, and when a Model Y variant is in stock on the day you order. Choose Havnby FlatCore when You drive a 2025–2026 Model Y. Havnby sells a FlatCore variant for it, and the Lost Horizon variants we checked name only the 2020–2024 Model Y. [All 4 reasons](/vs/havnby-vs-lost-horizon#decision) Choose Lost Horizon when You want the lower 4.5-inch profile for more headroom. [All 4 reasons](/vs/havnby-vs-lost-horizon#decision) On this page ## Specifications We read the Havnby product page and policy pages on 1 October 2026 with the US store setting. Lost Horizon’s size, depth, weight, R-13 claim and materials were recorded from the seller on 19 August 2026. We checked the Lost Horizon Model Y stock in its own store on 1 October 2026. | Factor | Havnby FlatCore | Lost Horizon Model Y | | --- | --- | --- | | Price checked 1 October 2026 | **$549** for both Model Y year ranges | **$229.99 with pump, $199.99 without**; both unavailable in the Lost Horizon store | | Vehicle fit | Model Y 2020–2024 and Model Y 2025–2026 variants | Model Y 2020–2024 on the Amazon variants we checked on 18 September 2026 | | Size | 193 × 132 cm (76 × 52 in) | | | Depth | 19 cm (7.5 in) at the seatback end, 7.9 cm (3.1 in) at the trunk end | 11.4 cm (4.5 in) | | Weight | 5.1 kg (11.2 lb) | 6.1 kg (13.5 lb) | | R-value | Not published | R-13 seller claim | | Pump | Built-in 12V ABS pump | Rechargeable pump in the pump bundle only | | Warranty | 3 years for orders from 1 June 2026 | 1 year | | Next step Affiliate links: we may earn a commission at no extra cost to you. | [Review: Havnby FlatCore Foam Mattress](/reviews/havnby-autolevel) | [Review: Lost Horizon Standard](/reviews/lost-horizon-tesla-mattress) | ## What this comparison can and cannot establish ### What the sources establish - Published size, depth and weight - Construction and pump type - Warranty and trial terms - Dated list prices ### What remains unknown - Fit in your exact car - Overnight comfort - Pump noise - Long-term durability ## What the price gap buys **$319.01** The FlatCore cost $549 and the Lost Horizon Model Y pump bundle was listed at $229.99 on 1 October 2026. The Lost Horizon bundle was unavailable that day, so the gap applies only when the bundle returns at that price. For the extra money, Havnby lists a shaped profile, an integrated 12V pump, a fitted sheet, a storage bag, a 60-day trial and a three-year warranty. Those are listed features. They do not prove that the FlatCore gives better sleep to every person. Lost Horizon is the lower-cost choice when it is in stock. Amazon also sells a Lost Horizon Standard pump bundle. We did not record its Amazon price on 1 October 2026, so check the live listing before you compare totals. ## Slope support and headroom Havnby FlatCore 7.5 in to 3.1 in, shaped Havnby makes the FlatCore thicker at the seatback end and thinner at the trunk end, so that it fills the step of the folded Model Y seats. Havnby publishes no measured angle, and we did not measure one. Lost Horizon Standard 4.5 in, one even layer Lost Horizon uses foam and adjustable air in one 4.5-inch layer. It publishes no slope-correction shape. The lower profile leaves more room between the sleeper and the roof. Havnby FlatCore product image supplied by Havnby. Select the Model Y year range before you order. Lost Horizon product image. The bundle contents depend on the variant you select. **Juniper owners** The Lost Horizon Amazon variants we checked on 18 September 2026 name the Model Y 2020–2024. Havnby sells a separate FlatCore variant for the 2025–2026 Model Y at the same $549 price. ## Cold-weather evidence Havnby FlatCore R-value not published Havnby publishes no R-value for the FlatCore. Lost Horizon Standard R-13 seller claim Lost Horizon publishes R-13 for its Standard model. We found no linked independent test, so we treat R-13 as a seller claim. **Camp Mode still matters** Camp Mode can heat the cabin, but the mattress still controls how fast the cargo floor takes heat from the sleeper. Plan for battery use and condensation on cold nights. ## Pump and setup Havnby FlatCore Built-in 12V pump, about 80 s Havnby states about 80 seconds to inflate and about 90 seconds to deflate. The packed FlatCore measures 67 × 43 cm. Lost Horizon Standard Pump only in the bundle Lost Horizon sells the Model Y mattress with and without a rechargeable pump. Pick the bundle you need before you compare prices. The operator owns a FlatCore Model Y and a FlatCore Solo. His [Havnby Solo vs Full Size video](https://www.youtube.com/watch?v=xqTR1f3YSSY) (the operator’s YouTube channel, 15 July 2026) shows both mattresses in a Model Y. It gives no measurement. Our owner experience covers the Havnby side only. ## Trial, returns and warranty Havnby FlatCore 60-day trial, 3-year warranty Havnby gives a 60-day sleep trial from delivery. An opened return can cost a condition fee: $15 or $30 on the returns page, $10 or $20 on the refund policy. Both pages were read on 1 October 2026. Lost Horizon Standard 1-year warranty Lost Horizon publishes a one-year warranty. Read the return terms of the store you order from before you open the mattress. **Ask about the fee in writing** Havnby’s two policy pages give different fees for an opened return. Ask Havnby which fee applies before you open the box. ## Four reasons for each ### Choose Havnby FlatCore when - You drive a 2025–2026 Model Y. Havnby sells a FlatCore variant for it, and the Lost Horizon variants we checked name only the 2020–2024 Model Y. - You want the 7.5-inch seatback end and 3.1-inch trunk end to take up the seat slope. - You want a 60-day trial and a three-year warranty instead of a one-year warranty. - You want the 12V pump, storage bag and fitted sheet in one $549 box. ### Choose Lost Horizon when - You want the lower 4.5-inch profile for more headroom. - A published R-13 seller claim matters for cold nights. - The $229.99 pump bundle or the $199.99 mattress-only variant is back in stock when you order. - You prefer the Amazon Standard pump bundle (B0DGG69N9Y) and its Amazon delivery terms. ## Pick the exact Model Y year and pump option **Affiliate links.** We may earn a commission at no extra cost to you. Check the final total before you pay. [Affiliate disclosure](/disclosure) ### Havnby 10% off `AWD` **Cart-tested 16 Sep 2026** The code page shows the full cart test. [See Havnby price and terms](/discounts/havnby) ### Lost Horizon We have no partner code for Lost Horizon. The link opens the seller page. For Havnby, confirm the Model Y year range and the delivered total. For Lost Horizon, confirm that a Model Y variant is in stock and whether the pump is in the box. [Read the Lost Horizon variant notes](/reviews/lost-horizon-tesla-mattress) [Compare the full Model Y mattress shortlist](/guides/best-model-y-mattress) ## Frequently asked questions Is Havnby better than Lost Horizon? For slope support, trial and warranty, the Havnby FlatCore lists more: a shaped 7.5-to-3.1-inch profile, a 60-day trial and a three-year warranty. Lost Horizon is thinner, publishes R-13 and costs less when its Model Y options are in stock. Does Lost Horizon fit the 2025 Model Y Juniper? The Lost Horizon Amazon variants we checked on 18 September 2026 name the Model Y 2020–2024 only. Havnby sells a separate FlatCore variant for the 2025–2026 Model Y. Which mattress is warmer? Lost Horizon publishes R-13 for its Standard model. Havnby publishes no R-value. We found no independent test for either mattress, so we cannot name a measured winner. Which mattress leaves more headroom? Lost Horizon, at 4.5 inches. The FlatCore is 7.5 inches at the seatback end and 3.1 inches at the trunk end. Was Lost Horizon in stock on 1 October 2026? Not for the Model Y in its own store. Lost Horizon listed the Model Y mattress at $199.99 and the pump bundle at $229.99, and marked both unavailable. The Model 3 mattress-only option was available at $199.99. ## Sources **[Havnby FlatCore listing](https://havnby.com/products/flatcore-hybrid-support-mattress-for-tesla-model-y) havnby.com, product page, US store** Checked 1 Oct 2026 **[Havnby returns page](https://havnby.com/pages/returns-policy), [refund policy](https://havnby.com/policies/refund-policy) and [warranty page](https://havnby.com/pages/warranty) havnby.com** Checked 1 Oct 2026 **[Lost Horizon Tesla mattress listing](https://losthorizonlife.com/products/tesla) losthorizonlife.com, variant stock** Checked 1 Oct 2026 **Lost Horizon specifications and warranty losthorizonlife.com** Recorded 19 Aug 2026 **Amazon Standard pump bundle, B0DGG69N9Y amazon.com, vehicle years** Checked 18 Sep 2026 **[Havnby Solo vs Full Size](https://www.youtube.com/watch?v=xqTR1f3YSSY) YouTube, the operator’s channel** Published 15 Jul 2026 We did not measure fit, slope, warmth or durability for either mattress. By [Fredrik Mastouri](/about). Page revised 1 Oct 2026. We have not performed a controlled comfort or durability test. [How we review](/methodology) Keep researching ## Follow the full evidence trail ### Full reviews - [**Havnby FlatCore** $549 · checked 29 Sep 2026 Our rating **83**](/reviews/havnby-autolevel) - [**Lost Horizon Standard** Check seller Our rating **74**](/reviews/lost-horizon-tesla-mattress) ### Related head-to-heads - [**Snuuzu vs Havnby** $899 vs $549](/vs/snuuzu-vs-havnby) - [**Havnby vs NovaPads** $549 vs $239](/vs/havnby-vs-novapads) - [**Havnby FlatCore vs CloudCore** $549 vs $399](/vs/havnby-flatcore-vs-cloudcore) - [**Snuuzu vs Lost Horizon** $899 vs –](/vs/snuuzu-vs-lost-horizon) ### Guides and method - [**Is Havnby legit?**](/faq/is-havnby-legit) - [**See the full Model Y comparison**](/guides/best-model-y-mattress) - [**How we review** Evidence levels and Our rating](/methodology) - [**All comparisons** Every head-to-head](/vs) By Tesla Mattress Guide Page last revised 1 Oct 2026