I-Beam vs Coil Air Bed Construction — What Makes a Difference

If you have ever looked at an air bed cross-section in a product description, you will have seen terms like "I-beam" and "coil beam" describing the internal structure. These construction methods directly affect how the bed feels, how it supports your weight and how durable it is. Here is what the differences actually mean in practice for summer 2026 campers.

I-Beam Construction Explained

I-beam air beds have horizontal tubes or channels running the width of the bed, created by welding the top and bottom PVC layers together at intervals. When inflated, these channels form parallel ridges separated by shallow valleys — like a row of sausages side by side.

Hi-Gear, Kampa and the entry-level ranges from Vango and Coleman primarily use I-beam construction. It is the standard method for budget and mid-range air beds.

How I-Beams Feel

On a well-inflated I-beam bed, you feel the ridges through a sheet or sleeping bag. The bed surface is not perfectly flat — it undulates slightly. Heavier body parts sink deeper into the channels than lighter ones, creating an uneven surface. This effect is more noticeable on cheaper beds with wider beam spacing.

I-Beam Pros

• Lightweight — fewer internal welds means less material.
• Affordable — simpler manufacturing process.
• Fast inflation — air flows freely through the connected channels.
• Easy to repair — the simple internal structure means patches adhere to flat surfaces.

I-Beam Cons

• Uneven surface — the ridge-and-valley pattern is noticeable, especially for side sleepers.
• Roll-together on doubles — I-beam channels run side to side, creating a natural centre valley that pulls both sleepers inward.
• Less support at edges — the outer beams compress easily when you sit on the bed edge.

Coil Beam Construction Explained

Coil beam beds use dozens (sometimes hundreds) of individual vertical air columns connecting the top and bottom surfaces. Each coil acts as an independent support point, creating a grid of small air springs across the entire sleeping surface.

Outwell and Coleman use coil construction in their premium ranges. Vango's Blissful series also features coil technology. You will not typically find coil construction under 40 pounds — it is a premium feature.

How Coils Feel

The difference is immediately noticeable. A coil-beam bed feels flat, stable and uniform. There are no ridges or valleys. Your body weight is distributed evenly because each coil compresses independently — heavier areas push down their local coils without affecting adjacent ones.

Coil Pros

• Flat, even sleeping surface — close to a real mattress feel.
• Independent weight distribution — two people of different weights do not roll together.
• Better edge support — coils at the perimeter maintain structure when you sit on the edge.
• More comfortable for all sleeping positions — side sleepers especially benefit from the uniform surface.

Coil Cons

• Heavier — more internal structure means more material and weight.
• More expensive — manufacturing is more complex.
• Slower inflation — air must fill each individual coil rather than flowing through open channels.
• Harder to fully deflate — air can get trapped in individual coils, making pack-down slightly slower.

Which Construction Suits You?

• Solo camper on a budget: I-beam. On a single bed, the ridge effect is minimal and the weight savings are welcome.
• Couple sharing a double: Coil. The anti-roll-together benefit alone justifies the upgrade. Outwell's Reel range is purpose-built for this.
• Family with multiple beds: Mix both. Coil for the parents' double, I-beam for kids' singles to keep costs reasonable.
• Frequent camper: Coil. The comfort difference compounds over many nights across a season.
• Festival or occasional camper: I-beam. Save the money for the ticket.

Other Construction Methods

Some premium beds use a honeycomb or wave-beam pattern instead of traditional I-beams or coils. These are less common but aim to offer coil-like performance at a lower cost. Kampa has experimented with wave-beam designs in some mid-range models.

Whatever construction you choose, pair your bed with a good pump, a season-appropriate sleeping bag and consider a camp bed if you want a completely flat sleeping surface without relying on air construction at all.

Browse I-beam and coil options in our camping air beds collection and get your summer 2026 sleep setup right.