The verdict
TESMAT lists the Horizon as in stock, and it takes Best mid-price in this comparison, with the highest overall score in the $300 to $600 band, at #3 of 19. Everything on this page is drawn from what TESMAT publishes about the Horizon (its construction, specifications, and kit contents) and from owner reports.
On paper the Horizon is an ambitious spec: dual foam over a 3D-grid air base, a wireless USB-C rechargeable pump, sub-minute inflation, and a contoured profile that TESMAT says cancels the seat incline, for $439 on sale ($489 regular). The counterweights are the missing basics and the brand's reputation: TESMAT publishes no warranty and no length or width for the Horizon, and it sits at 2.4 out of 5 on Trustpilot across 10 reviews, with recurring complaints about customer service and order handling.
Who it's for
You'll love it if you are a US buyer who wants foam over an air base, a wireless pump, a fitted sheet and a carry case in one purchase at a mid-range price, and you are comfortable with the brand's current Trustpilot record.
Look elsewhere if you want a published warranty, or if dependable support matters most: owners report slow or missing deliveries and cancellation requests that went unanswered. Both the Snuuzu and the Havnby FlatCore publish a 3-year warranty: the Snuuzu scores higher on comfort at about twice the price, and the FlatCore pairs a fixed taper with a built-in 12V pump at $549.
What you'll notice
What the manufacturer describes: construction
According to TESMAT's product page, the Horizon uses a dual memory-foam layer over a 3D-grid air base layer. TESMAT calls it a self-inflating hybrid: open the valves and, in its words, the enclosed memory foam expands and inflates the mattress in about 20 minutes. At 15 cm / 6 inches thick, it is thinner than the Snuuzu (20 cm) but thicker than the Tesery. TESMAT sells separate versions for the Model Y and the Model 3.
What the manufacturer describes: setup and pump
TESMAT describes an external wireless USB-C rechargeable pump that inflates the mattress in under one minute. The pump is included in the kit. Because the pump is external rather than built into the mattress body, the mattress itself is separate from the inflation mechanism, a different trade-off from the integrated-pump designs in this comparison.
What the kit includes
The $439 sale price ($489 regular) covers the mattress, a carry case, the USB-C pump, and a fitted sheet. TESMAT says the packed case fits the sub-trunk or frunk. Window shades are sold separately and are not part of this kit. There is no separate leveling component: TESMAT says the mattress's own contoured profile does that job.
What TESMAT does not publish
TESMAT does not publish the Horizon's length or width, and it does not publish a warranty. That makes the fit harder to check before you buy and leaves you without stated cover if something fails. Its reviews page pools every TESMAT product, and only a few of the reviews shown there are attached to the Horizon.
What to watch for
Refunds and cancellations
The Horizon is in stock, and TESMAT says orders ship within 5 to 7 days while it works through a launch backlog. Two other things are worth knowing before you pay. The product page advertises 30-day returns, but TESMAT's refund policy requires the item to be unused and says sale items cannot be refunded, and the Horizon is currently sold at a sale price. TESMAT's Trustpilot record also includes complaints about non-response to cancellation requests. If your circumstances change and you need to cancel, that history is relevant.
Independent brand reputation
TESMAT's own reviews page shows about 1,000 reviews across all its products, 81% of them five-star, and TESMAT hosts it on its own site. Its Trustpilot page shows 2.4 out of 5 across 10 reviews, 80% of them one-star. The Trustpilot reviews are consistently about service: order handling, cancellation response, and returns. Owner complaints mention slow or missing deliveries and one pump that did not work. The mattress construction is described positively on paper; the brand's fulfilment track record is the risk factor.
The slope claim
TESMAT says the Horizon's contoured profile, with varying thickness, cancels the incline of the folded rear seats, and calls the result a flat, 0-degree sleeping surface. That is the manufacturer's claim. Like every mattress in this comparison, it cannot level a car that is parked on a slope.
The bottom line
The TESMAT Horizon reads well on the manufacturer's page: foam over an air base, a fast wireless pump, a contoured profile for the seat incline, and separate versions for the two most popular Teslas, at $439 on sale ($489 regular). That earns it #3 of 19 and the Best mid-price award. The decision comes down to how much weight you give the product spec versus the missing warranty, the no-refund rule on sale items and the brand's current Trustpilot record.