Therm-a-Rest vs Lost Horizon: Sleeping Pads Compared by Specs

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This therm a rest vs lost horizon sleeping pad comparison looks at two self-inflating foam options. Both use foam filling for comfort and insulation. The main difference is scale. The Therm-a-Rest Basecamp is a compact, portable pad for car camping or base camps. The Lost Horizon Option3 is a full-size mattress designed for stationary use. You will see how thickness, weight, and valve types change the experience for you.

R-Value

6

13

Thickness

2 inches

4.5 inches

Dimensions

30 x 77 inches

52 x 80 inches

Weight

4 pounds

16.1 pounds

Valve Type

WingLock valve

Twist valve

Weight Capacity

not listed

440 pounds

Choose the first if

• You need a lightweight pad that fits in a stuff sack.
• You want faster inflation and deflation with a specialized valve.
• You are camping in three-season conditions with moderate cold.

Choose the second if

• You prefer a bed-like height and wide sleeping surface.
• You need maximum insulation for winter camping in cold environments.
• You are car camping and do not need to carry the pad far.

Verdict

The Therm-a-Rest Basecamp is the better choice if you value portability and quick setup. The Lost Horizon Option3 is ideal if you prioritize extreme comfort and insulation over weight. Your decision depends on whether you are carrying gear or leaving it in a vehicle.

Therm-a-Rest vs Lost Horizon Specs

Insulation rating

Edge: Lost Horizon Full Self-Inflating Foam Mattress

The Lost Horizon Option3 offers an R-value of 13, which provides exceptional insulation for cold environments. This high rating makes it suitable for four-season use, including winter camping. In contrast, the Therm-a-Rest Basecamp has an R-value of 6. While this still offers year-round insulation, it is less effective in extreme cold than the Lost Horizon. If you plan to camp in freezing temperatures, the higher R-value of the Lost Horizon provides a clear thermal advantage. The Therm-a-Rest is better suited for milder conditions where moderate insulation is sufficient.

Pad thickness

Edge: Lost Horizon Full Self-Inflating Foam Mattress

Thickness directly impacts comfort and ground insulation. The Lost Horizon Option3 is 4.5 inches thick, providing a substantial layer of foam and air. This extra height reduces pressure points and enhances comfort significantly. The Therm-a-Rest Basecamp is 2 inches thick. While this is standard for self-inflating pads, it offers less cushioning than the Lost Horizon. The 4.5-inch profile of the Lost Horizon feels more like a mattress, whereas the Therm-a-Rest feels more like a traditional camping pad. For maximum comfort, the thicker Lost Horizon is superior.

Pad dimensions

Edge: Lost Horizon Full Self-Inflating Foam Mattress

Size matters for comfort and storage. The Lost Horizon Option3 measures 80 x 52 inches, offering a Full-size surface area. This wide space accommodates larger body types and allows for more movement. The Therm-a-Rest Basecamp is X-Large at 77 x 30 inches. While 77 inches is a decent length, the 30-inch width is significantly narrower than the 52-inch width of the Lost Horizon. The Lost Horizon provides nearly twice the width, making it much more spacious. For side sleepers or wider users, the Lost Horizon is the better choice.

Weight and portability

Edge: Therm-a-Rest Basecamp X-Large

Portability is crucial for base camp comfort versus backpacking. The Therm-a-Rest Basecamp weighs 4 pounds and rolls up to 31 x 7.5 inches. This compact size makes it easy to carry and store in a car trunk. The Lost Horizon Option3 weighs 16.1 pounds and is much bulkier due to its size and foam density. The Lost Horizon is not recommended for backpacking. The Therm-a-Rest is far lighter and more portable. If you need to move the pad frequently or carry it over short distances, the Therm-a-Rest is the practical option.

Inflation mechanism

Edge: Therm-a-Rest Basecamp X-Large

Both pads are self-inflating, but the valves differ. The Therm-a-Rest uses a WingLock valve that inflates three times faster than a classic valve and allows for lightning-fast deflation. This is designed for convenience and speed. The Lost Horizon uses a twist valve. While easy to inflate, deflating it can be challenging due to its bulk and weight. The Lost Horizon suggests using a separate electric pump for easier deflation. The Therm-a-Rest valve system is more efficient for quick setup and takedown without extra tools.

Choose your sleeping pad by needs

Backpackers or hikers needing lightweight gear

Our pick: Therm-a-Rest Basecamp X-Large

The Therm-a-Rest Basecamp weighs only 4 pounds. This makes it much easier to carry on long trails than the Lost Horizon, which weighs 16.1 pounds. You should choose this pad if portability is your main concern. Its compact rolled size of 31×7.5 inches fits easily into a pack. The 4-pound weight allows you to save energy while hiking to your campsite.

Car campers seeking maximum warmth and comfort

Our pick: Lost Horizon Full Self-Inflating Foam Mattress

The Lost Horizon Option3 offers an R-value of 13. This provides superior insulation for cold ground compared to the Therm-a-Rest's R-value of 6. You should pick this pad for winter camping or cold nights. Its 4.5-inch thickness and 12-pound foam filling create a plush, supportive surface. This high insulation rating ensures you stay warm in freezing temperatures.

Couples or larger individuals needing space

Our pick: Lost Horizon Full Self-Inflating Foam Mattress

The Lost Horizon Full measures 80 x 52 inches. This offers significantly more surface area than the Therm-a-Rest, which is 77 x 30 inches. You should choose this option if you share your sleeping space. The extra width accommodates two people comfortably. It also supports up to 440 pounds, making it suitable for larger body types who need extra stability and room.

Specifications side by side

Spec	Therm-a-Rest Basecamp X-Large	Lost Horizon Full Self-Inflating Foam Mattress
R-Value	6	13
Thickness	2 inches	4.5 inches
Pad Type	Self-inflating foam	Self-inflating foam
Inflation Method	WingLock valve, breath	Twist valve
Dimensions	77 x 30 inches	80 x 52 inches
Insulation Material	Thermal foam	Foam filling
Season	–	4-Season
Features	–	Mattress
Color	Poseidon Blue	Brown
Recommended Use	Camping	Camping
Weight	4 pounds	16.1 pounds
Size	X-Large – 30 x 77 Inches	Full
Model	040818132838	LHCM

Frequently asked questions

Which sleeping pad is better for winter camping?

The Lost Horizon Full Self-Inflating Foam Mattress is the better choice for cold conditions. It is rated for four-season use and features a high R-value of 13. This insulation level keeps you warm in freezing temperatures. The Therm-a-Rest Basecamp has a lower R-value of 6, which is less effective for winter environments.

How wide is the Lost Horizon sleeping pad?

The Lost Horizon Full Self-Inflating Foam Mattress is 52 inches wide. This width classifies it as a full-size mattress. It provides significantly more lateral space than the Therm-a-Rest Basecamp, which is 30 inches wide. The extra width offers greater stability and comfort for side sleepers or those who move around at night.

What is the thickness difference between these two pads?

The Lost Horizon pad is 4.5 inches thick, while the Therm-a-Rest Basecamp is 2 inches thick. The Lost Horizon offers a much plushier feel due to its greater height. The Therm-a-Rest is thinner, which helps reduce bulk and weight. You should choose the thicker pad if you prioritize cushioning over packability.

Which pad is lighter to carry?

The Therm-a-Rest Basecamp X-Large is lighter, weighing 4 pounds. The Lost Horizon Full Self-Inflating Foam Mattress weighs 16.1 pounds. The Therm-a-Rest is nearly four times lighter. If you need to carry your gear over long distances, the Therm-a-Rest is the more practical option for portability.

Are both pads self-inflating?

Yes, both products are self-inflating sleeping pads. They use foam filling that expands to draw in air when the valve is opened. This mechanism reduces the effort needed to inflate them compared to manual pump pads. Both designs rely on this internal foam structure for initial expansion and insulation.

What size options are available for these pads?

The Therm-a-Rest Basecamp comes in an X-Large size measuring 30 by 77 inches. The Lost Horizon is a Full size, measuring 52 by 80 inches. The Lost Horizon provides more surface area for taller or larger users. The Therm-a-Rest is compact and suitable for standard sleeping bags.

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