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Semi truck mattress sizes, and which 42×80 to buy (2026)

Bunk Ledger editors

A made bed with white linens, a stand-in for sleep gear rather than a measured truck bunk
Vyacheslav Argenberg. CC BY 4.0. Via Wikimedia Commons.

A 42×80 is four inches wider than a Twin XL and the same 80-inch length. That is the whole reason a household sheet set fails, and the whole reason a chart that says "your model takes a 42" can still be wrong. Measure the bunk pan. Seller charts do not agree with each other.

The sizes people mix up

These household sizes are the US ones used on mattress labels. The truck sizes under them are sizes specialty makers actually cut. They are not a federal standard.

On a phone, this table moves sideways. The first column stays put.

Width and length in inches. Household sizes are the usual US finished sizes. Truck sizes are what bunk makers publish, not a guarantee for your cab.
NameWideLongWhat goes wrong in a sleeper
Twin3875Right-ish width for some bunks, five inches short of an 80-inch pan
Twin XL3880Length matches a 42×80. Width is four inches narrow. Fitted sheets will not cover a 42
42×80 truck4280The common wide lower-bunk size. Useless if your pan is under 42 at any point
Full5475Wider than a bunk wants, and five inches short
Queen6080The right length and far too wide for a normal sleeper
Bar chart of mattress widths: Twin XL 38, truck 42 by 80, full 54, queen 60. Lengths are labeled beside the bars.

SleepDog, one truck-mattress maker, labels its own cuts A 36×80, B 39×80, C 42×80, and a bunk cut D 32×80. Those letters are a catalog, not an industry code. The same maker's model list and another maker's model list do not line up truck for truck. SleeperKing's Volvo page says a VNL 760, 780, and 860 take 42×80. SleepDog's size guide puts at least some VNL 740 and 760 trucks on a 39×80. Both pages tell you to measure. Believe the tape, not the row that flatters the mattress they have in stock.

How to measure the pan

Do this on the bare platform, not across a mattress that has taken a set.

  1. Lift the old mattress out. If it has a law label ("UNDER PENALTY OF LAW this tag not to be removed except by the consumer"), photograph the finished size before you throw it away. Estee Bedding's truck size guide points at that tag for a reason: it is the size the old mattress was built to, not the size it sagged to.
  2. Measure length and width at both ends and in the middle, to the nearest quarter inch. Cabs are not perfect rectangles. The narrowest width is the one that matters.
  3. Subtract about an inch from a tight measurement if you want the new mattress to drop in instead of bowing at the walls. A mattress cut exactly to a bowed pan will buckle.
  4. Sit up on the pan and measure the air above your shoulder to the ceiling, the upper bunk, the cabinet, or the curtain track. That number, minus a little, is the thickest mattress you can live with.

Thickness, without a fairy tale

Estee's guide says the truck mattresses they see are often 6 to 9 inches, that up to about 10 inches is a workable lower bunk in many cabs, and that upper bunks usually need to stay around 3 to 5 inches so you can still sit. SleepDog sells lower-bunk builds in a 7-inch and a 9-inch. Those are seller ranges. Your cabinet does not care what a website calls normal.

A thicker mattress is not automatically a better night. It eats the sitting room you use to put socks on. On a team truck the upper bunk is the one that gets punished first.

Which 42×80 to buy

Buy the one that matches the pan you measured, in a thickness that leaves you room to sit, with a cover you can take off. That is the decision. There is no test winner on this page.

Use this order:

  1. If the narrowest width and the length land within about half an inch of 42 by 80, a stock 42×80 from a truck-mattress seller is the straightforward buy. Household Twin XL is the wrong width.
  2. If you are off by an inch or more, order a custom cut. Forcing a 42 into a 40.5-inch pan buckles the foam and fights the walls. A 42 on a 44-inch pan leaves a gap your hip finds at 2 a.m.
  3. Pick thickness from the sitting measurement, not from a photo. If the seller offers a shorter build and a taller one, take the one that still lets you sit up.
  4. Read the finished size on the listing, including thickness. If the listing will not state all three numbers, skip it.
  5. Prefer a zip cover you can wash. Drinks tip. Cab dust is constant. A cover you cannot remove becomes the smell of the truck.

Construction is a trade, not a ranking:

  • An all-foam build is lighter to carry through the door, and it has no springs to tick. It can also sleep warmer, and a very soft foam in a narrow bunk can feel like a hole you have to climb out of when you roll over. We have not slept on these.
  • A coil build feels more like a bed at home to a lot of people, and the edge can be easier to sit on. It usually weighs more, and a tall coil set is the one that hits the upper bunk.
  • Either way, the law label should list the finished size. If you are comparing two 42×80 listings and only one will say how thick it is and what the cover does, that is the clearer purchase. It is not a review score.

Sheets are the part families get wrong. A Twin XL fitted sheet is built for 38 inches. It will not grab a 42. Look for sheets sold as 42×80, or use a flat sheet and tuck it. Do not buy a queen set "because it is 80 inches long." The width will bunch into a lump against the wall.

New foam in a small cab can smell for a few days. Air it before a week-long trip if you can, not because of a health claim, but because you have to sleep next to it with the curtains shut.

The mattress size checker uses the same drop-in rule: about an inch of spare width and half an inch of spare length. It will not know if a cabinet post steals a corner.

Cooling language on a foam listing is marketing until the maker publishes a test you can read. A winter cab note covers heat and moisture. The mattress is not a heater.

Along the way

Inside a Peterbilt cab, the tight floor a mattress still has to share
User:Mahanga. CC BY 3.0. Via Wikimedia Commons.
A small camp light after dark, closer to bunk lighting than to a bedroom lamp
Ian D. Keating. CC BY 2.0. Via Wikimedia Commons.

Conclusion

The tape on the pan beats a catalog letter. If two sellers disagree about your truck, believe the narrower measurement.

FAQ

Is 42 by 80 the same as a Twin XL?

No. Twin XL is 38 by 80. The extra four inches are width, not length.

Do household sheets fit a truck cut?

Twin XL fitted sheets are cut for 38 inches. They do not fit a 42 inch width.

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