Quick Answer: CFM (cubic feet per minute) measures how much air can pass through a material under a standardised pressure differential. In mattresses, higher CFM indicates better passive airflow and faster heat dissipation. Coil-based mattresses have CFM values 4 to 10 times higher than closed-cell foam. Open-cell foam and latex fall in between. The material stack, not just the top layer, determines total mattress breathability.
In This Article
Reading Time: 8 minutesWhat CFM Measures and How It Is Tested
CFM, or cubic feet per minute, is the standard unit for measuring volumetric airflow. When applied to textile and foam materials, it describes how many cubic feet of air pass through one square foot of material per minute under a standardised pressure difference - typically 0.5 inches of water pressure in textile testing (ASTM D737 is the standard method).
A higher CFM rating means air moves through the material more easily. This directly affects how quickly body heat dissipates through the sleep surface. A mattress that traps air holds heat. A mattress that allows air to circulate carries that heat away.
CFM is not a number that appears on most consumer mattress product pages. It is primarily used in materials testing and B2B specifications. However, understanding the concept allows buyers to evaluate breathability claims by looking at the underlying materials rather than taking marketing language at face value.
Body Heat and Sleep Quality
Core body temperature naturally drops 1 to 2 degrees Celsius at sleep onset. Thermal environments that interfere with this drop delay sleep onset and reduce deep sleep stages. Research by Okamoto-Mizuno and Mizuno (2012) documented that thermal regulation has a direct measurable effect on sleep architecture, particularly slow-wave sleep and REM duration. A mattress that traps body heat around the sleeper creates a micro-environment that can resist the natural temperature drop the body is trying to achieve.
CFM Values by Mattress Material
Here are approximate CFM benchmarks for common mattress materials. These are drawn from materials science literature and manufacturer specification sheets, not from standardised consumer mattress testing (which does not yet exist in a universally adopted form):
| Material | Approximate CFM Range | Notes |
|---|---|---|
| Open-coil innerspring (air gap) | 200 to 400+ CFM | Air moves freely between coils in all directions |
| Pocket coil (air gap) | 150 to 300 CFM | Fabric pockets restrict airflow slightly vs open coil |
| Natural latex (Talalay) | 40 to 70 CFM | Pin-hole structure allows meaningful airflow |
| Natural latex (Dunlop) | 25 to 50 CFM | Denser structure, lower airflow than Talalay |
| Open-cell polyurethane foam | 15 to 35 CFM | Varies significantly by density and formulation |
| Memory foam (standard) | 3 to 12 CFM | Closed-cell structure severely restricts airflow |
| Memory foam (gel-infused) | 4 to 14 CFM | Gel absorbs heat briefly but does not improve airflow |
| Phase-change material covers | Varies | Affects surface temperature, not airflow through mattress |
The numbers illustrate the gap between coil systems and foam systems. An all-foam mattress, even one using open-cell formulations, allows dramatically less air movement than a coil-based system. This is why coil and hybrid mattresses are consistently cooler to sleep on than all-foam alternatives, regardless of what gel, graphite, or copper additives are used in the foam.
Why the Full Material Stack Matters
A mattress is not one material - it is a series of layers, and airflow is limited by the most restrictive layer in the stack. This is analogous to electrical resistance in series: the highest resistance material controls total throughput.
A hybrid mattress with a pocket coil base, a foam transition layer, and a memory foam comfort layer on top may have excellent airflow through the coil base but poor airflow at the sleeping surface where the memory foam is located. The memory foam layer acts as a cap on the system's breathability.
This is why the comfort layer material matters as much as the support core when evaluating cooling. A hybrid with a Talalay latex comfort layer (40 to 70 CFM) will sleep meaningfully cooler than a hybrid with a memory foam comfort layer (3 to 12 CFM) even if both have identical pocket coil bases.
What We Tell Hot Sleepers in Our Showroom
Talia on our team has a consistent approach with hot sleepers: "Start from the top and work down. What is touching your body? If it is memory foam, you will likely sleep warm regardless of what is underneath." We see this validated repeatedly in customer follow-ups. People who switch from an all-foam mattress with gel memory foam to a hybrid with a latex or microcoil comfort layer almost uniformly report sleeping cooler within the first week. The coil base helps, but the comfort layer is what makes the difference at the surface.
Cooling Claims vs Airflow Reality
The cooling mattress market is full of competing claims that require careful evaluation. Here is how to read them:
"Gel Memory Foam" Claims
Gel infusions in memory foam come in two types: gel beads mixed into the foam, and a gel layer swirled through the foam during manufacturing. Gel has a higher thermal mass than foam - meaning it can absorb more heat before its temperature rises noticeably. This creates a brief cooling sensation when you first lie on the mattress, but the gel eventually reaches body temperature. It does not improve CFM or airflow through the material.
"Copper Infused" and "Graphite Infused" Foam
Copper and graphite are high thermal conductivity materials. When infused into foam, they help conduct heat away from the surface more quickly than uninfused foam. This is a meaningful property, but it is conduction (heat moving through the material) rather than convection (heat carried away by moving air). High thermal conductivity helps with heat dissipation at the surface but does not address the underlying airflow limitation of closed-cell foam.
Phase-Change Material (PCM) Covers
Phase-change materials are embedded in mattress covers or top quilting. They absorb heat as they transition from solid to liquid phase (at a calibrated temperature, often around 33 to 36 degrees Celsius). This creates a genuinely cooling effect at the surface temperature level. PCM covers are one of the more technically legitimate cooling technologies, but they have limited thermal capacity and stop cooling once they have fully transitioned. In a hot environment, they may reach saturation within 30 to 60 minutes.
Mattress Foundations and Airflow
The foundation under a mattress significantly affects total system airflow. A solid platform bed or a solid-surface foundation blocks airflow through the mattress base entirely. Air can only enter and exit through the sides and top. A slatted foundation with gaps of at least 3 inches allows air to move through the mattress base, improving total ventilation by 20 to 40 percent compared to a solid platform.
Box springs with a fabric-covered open coil interior provide good underside airflow. Adjustable bases vary - some have ventilated surfaces, others are solid. If you are sleeping hot and have a solid platform bed, addressing the foundation can produce a noticeable improvement even without changing the mattress.
What Hot Sleepers Should Prioritise
In order of impact on sleeping temperature:
- Comfort layer material: Latex or microcoil over memory foam or standard polyurethane. The material touching your body has the most direct effect.
- Support core type: Coil core over all-foam core. The airflow difference is substantial.
- Cover fabric: Tencel or natural wool quilting over synthetic or thick polyester. Cover CFM affects surface feel even when the materials below are breathable.
- Foundation type: Slatted or ventilated over solid platform. Often overlooked but practically significant.
- Room temperature: No mattress technology replaces the effect of sleeping in a room below 20 degrees Celsius. Mattress cooling features reduce the gap between mattress micro-environment and room temperature; they do not replace room temperature management.
The Revive Tiffany Rose and Revive Jasmine (both $1,995) use Talalay copper-infused latex as the comfort layer - a combination that addresses both the conduction (copper) and airflow (Talalay's pin-hole structure) aspects of mattress cooling. For hot sleepers who can invest at this price point, this construction represents the most technically sound approach to sleeping cool. The Revive St Charles ($2,150) takes a similar approach with its upper layers.
Shop: Cooling Mattresses at Mattress Miracle
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Cooling picks we carry at Mattress Miracle:
Or cooling mattresses in our Brantford showroom.
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Call 519-770-0001Frequently Asked Questions
What CFM rating should I look for in a cooling mattress?
CFM is rarely published for consumer mattresses, but you can approximate it by looking at the comfort layer material. Latex comfort layers typically achieve 40 to 70 CFM; open-cell foam reaches 15 to 35 CFM; standard memory foam is typically below 12 CFM. If a manufacturer publishes breathability data, look for values in the 30+ CFM range for the comfort layer specifically.
Does gel memory foam actually sleep cooler?
Gel memory foam feels cooler to initial touch because gel has higher thermal mass than foam - it absorbs more heat before warming. However, it does not improve airflow through the material. Hot sleepers report that gel memory foam mattresses feel cooler for the first 20 to 30 minutes but behave similarly to standard memory foam through the night.
Is Talalay latex cooler than Dunlop latex?
Yes. Talalay latex is processed using a flash-freeze and vacuum method that creates a more uniform, open pin-hole structure throughout the material. This structure allows more airflow than Dunlop latex, which is denser and less permeable. Both are cooler than memory foam, but Talalay is the better choice specifically for heat dissipation.
Does mattress thickness affect breathability?
Yes. A thicker mattress has more material for heat to travel through before it can dissipate. A 14-inch mattress with multiple foam layers will trap more heat than a 10-inch mattress using the same top-layer material. If you run warm and are choosing between otherwise similar mattresses, the thinner option will generally breathe better.
Can a mattress topper help a hot sleeper?
A latex or wool topper can improve breathability if the existing mattress uses a memory foam comfort layer. Adding 2 to 3 inches of Talalay latex on top of a memory foam mattress places a breathable material at the sleeping surface and can noticeably reduce heat retention. This is a lower-cost alternative to mattress replacement for people whose existing mattress is otherwise performing well.
Sources
- Okamoto-Mizuno K, Mizuno K. (2012). Effects of thermal environment on sleep and circadian rhythm. Journal of Physiological Anthropology, 31(1), 14.
- Jacobson BH, Gemmell HA, Hayes BM, Altena TS. (2008). Grouped comparisons of sleep quality for new and personal bedding systems. Applied Ergonomics, 39(2), 247-254.
- Haskell EH, Palca JW, Walker JM, Berger RJ, Heller HC. (1981). The effects of high and low ambient temperatures on human sleep stages. Electroencephalography and Clinical Neurophysiology, 51(5), 494-501.
- Rintamaki H. (2007). Human responses to cold. Alaska Medicine, 49(2 Suppl), 29-31.
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