Lost Horizon Air and Foam Car Camping Mattress Full Review (2026)

What it is

This Lost Horizon mattress is the Full, or double, size in the brand's Air and Foam line, measuring 80 by 52 inches with a maximum thickness of 4.5 inches. It combines a foam top layer over an adjustable air chamber underneath, a hybrid design meant to give more consistent support than a pure air mattress while staying lighter and more packable than an all-foam pad. The mattress weighs about 16 pounds and is rated to hold up to 440 pounds, with an R-value of 13 that puts it in four-season insulation territory for keeping cold ground temperature from coming through.

Fit for the job

At 80 by 52 inches, the Full size gives two adults real room to spread out inside an SUV cargo area or a truck bed, rather than the tighter fit of a twin-size pad, though buyers should measure their specific vehicle's cargo space before assuming it fits, since a full-size mattress can be tight in smaller hatchbacks or compact SUVs once the rear seats are folded down. The foam-over-air design is meant to solve the main complaint with pure air mattresses, that they can feel unstable or bouncy, by giving the sleeper a firmer foam surface to lie on while the air chamber underneath still allows some adjustable firmness. For car campers who have been unhappy with how a plain air bed feels, this hybrid approach is the main reason to consider it over a cheaper single-chamber alternative.

Features and specs

The air chamber underneath the foam top can be adjusted for firmness by adding or releasing air, letting sleepers dial in a softer or firmer feel rather than being stuck with whatever a fixed-foam pad offers. Lost Horizon rates the mattress with an R-value of 13, a relatively high figure meant to block cold transferring up from the ground or a cold truck bed floor, which matters for shoulder-season and cold-weather car camping more than for warm summer trips. The mattress is designed to twist-valve inflate on its own to some degree, with an optional pump available separately to speed up inflation and fine-tune the final firmness beyond what self-inflation alone provides.

Build and materials

The top surface uses a 30D stretch fabric chosen for a softer feel against skin or a sleeping bag, while the bottom uses a tougher 75D fabric better suited to resisting abrasion from a truck bed liner or tent floor. The included storage bag is made from 150D oxford cloth, a heavier duty fabric meant to survive being tossed in and out of a vehicle repeatedly between trips. Lost Horizon backs the mattress with a one year warranty, which is on the shorter side compared with premium car camping pads from brands like Exped or NEMO, though the price point here is generally lower than those alternatives as well.

Value

This mattress is positioned as a value alternative to premium hybrid car camping pads, offering a similar foam-over-air concept at a lower price than brands like Exped's MegaMat or NEMO's Roamer line. The main costs of that lower price are a shorter one-year warranty and a packed size that stays fairly bulky since the foam layer does not compress down as flat as a pure air mattress would, so buyers with limited storage space should plan for that bulk. For car campers who want more stability and insulation than a basic air bed without paying premium hybrid-mattress prices, this is a reasonable middle option, provided the Full size actually fits your vehicle's cargo space.

Frequently asked questions