What is blended latex foam?

Blended latex usually means latex foam made with natural and synthetic materials.

Talalay Global says its natural latex comes from rubber-tree sap, and SBR is one synthetic rubber used in latex foam. A mattress may use the foam for comfort, support, or both.

The natural and synthetic parts come from different sources, and buyers can ask a maker whether a foam uses one or both.

Natural rubber

Talalay Global says its natural latex comes from rubber-tree sap.

• Ask whether the foam includes natural rubber.
• FloBeds describes natural latex as a choice for people seeking a “chemical-free” bed; check the product’s actual materials.

Synthetic latex

Synthetic latex can be made with SBR, or styrene-butadiene rubber.

• Ask whether the foam contains SBR, natural rubber, or both.
• Brooklyn Bedding says SBR has some superior properties, including resistance to heat aging, abrasion, and softening.

Natural-to-synthetic ratios vary by maker; the examples below are not one standard formula.

• GoodBed gives 70% synthetic and 30% natural as a typical blend.
• Brooklyn Bedding says companies commonly offer ratios from 60/40 to 70/30 synthetic-to-natural.
• Avocado gives a different typical ratio: about 80% synthetic and 20% natural.
• FloBeds says it used to offer a blend of 30% natural and 70% synthetic latex.
• Ask the maker for its formula, since ratios are proprietary to each mattress manufacturer.

Dunlop and Talalay name production processes, not the rubber source. Either process can use natural, synthetic, or blended latex.

Talalay Global describes a vacuum stage in its Talalay process.

A California regulation also describes latex foam as a molded fill containing an outer skin or as slabstock fill.

Blended latex may be used in a mattress comfort layer, support layer, or both.

Comfort layer

A comfort layer of blended latex may offer pressure relief, which GoodBed identifies as especially important for side sleepers.

• Softer Talalay layers can provide comfort and pressure relief, according to Talalay Global.
• Check which mattress layer uses latex if you want to know where it sits.

Support layer

Blended latex may also be used as a support layer.

• Talalay Global makes support cores as well as pressure-relief layers.
• Avocado describes a 1-inch layer beneath its innerspring support coil unit as a core base component.
• Sofz Sleep says most mattress manufacturers use Dunlop latex to make mattresses, while Talalay latex is reserved for top comfort layers.

Price and durability details can depend on the maker and product. The examples below are maker-specific, not guarantees for every latex mattress.

Blended latex

FloBeds reported that, at the time it described its purchasing experience, the price difference between its natural and blended products was less than 10%.

• Treat that price difference as specific to FloBeds and the time it reported it.
• FloBeds reported that Latex International testing over 10 years showed a 2.6% increase in natural latex softening and a less than 1% increase in height loss of natural latex versus blended.

100% natural latex

Avocado says its latex is 100% GOLS organic certified and contains no synthetic rubber or blends.

• If a listing does not specify “100% natural latex,” Avocado advises asking the brand directly.
• Check the product’s own materials rather than assuming the same description applies to every mattress.

Synthetic latex

The cited facts do not give a general price or durability comparison for synthetic latex alone.

Blended latex is available in several firmness options, but a mattress made with layers may not have one foam IFD rating.

Talalay Global lists its latex firmness range from 8 ILD to around 44 ILD. Softer Talalay layers can provide comfort and pressure relief, while firmer Talalay layers can offer deep support.

Ask for the firmness of the finished mattress and the role of each layer, rather than relying on a single foam rating.

A label that says only “latex” may leave the latex blend unclear, so ask the maker for the material details.

• A listing that says “latex” may not say whether it is synthetic or blended.
• The exact word “blended” may not appear in a mattress description.
• Avocado says filling-material percentages on its label are by weight.
• Ask the maker for the natural-to-synthetic ratio, since ratios are proprietary by manufacturer.
• Check what a certification covers: Sleep On Latex says its standard includes content analysis for synthetic latex and fillers.

Blended latex can include other ingredients, but the word “latex” alone does not establish whether a particular mattress contains fillers.

A U.S. Customs ruling listed synthetic rubber, natural rubber, active fillers, softener, and antioxidant as separate components in one latex-foam block.

In a study of natural-rubber latex foam, increasing calcium-carbonate content increased density, compression set, and depression in the tested foam.

• A study says rubber-foam softness or firmness can depend on the compounded-latex formula.
• Sofz Sleep says it is common for manufacturers in Asia to add chalk or calcium fillers to use less latex; this is the seller’s claim, not a statement about all manufacturers.
• Ask the maker whether a specific foam contains fillers, or check whether a cited certification includes filler analysis.

Can you tell the blend ratio by feel?

FloBeds says the appearance, touch, feel, and performance are virtually the same, so feel may not reveal the exact blend.

How can you verify a mattress's latex blend?

Ask the manufacturer for the natural and synthetic content if the listing does not specify it.

Check the law label for filling-material percentages, but note that those percentages are by weight, not a layer-by-layer recipe.

Ask for a layer-by-layer breakdown, since blended latex may be in the comfort layer, support layer, or both.

Can blended latex contain fillers, and how do fillers differ from synthetic rubber?

In the cited U.S. Customs ruling, active fillers were listed separately from synthetic rubber.

A U.S. Customs ruling listed active fillers separately from natural and synthetic rubber in one formulation.

A study describes natural rubber foam filled with activated charcoal and silica; another study investigated calcium carbonate and crumb rubber as fillers.

Does blended latex contain fillers?

Some latex-foam formulations include fillers, but the word “latex” does not confirm whether a mattress contains them.

A U.S. Customs ruling documented one latex mattress-block mixture with rubber and separately identified active fillers, softener, and antioxidant.

Ask the manufacturer or check whether a certification includes content analysis for fillers. Manufacturing additives such as soap and vulcanization agents do not by themselves show that a foam contains fillers.

We read 16 published pages from 13 sites (goodbed.com, brooklynbedding.com, avocadogreenmattress.com, talalayglobal.com and 9 more), checked in October 2026. Every sentence in the answers above cites one of them; the offer card at the end names its own source. This page reports published sources only; we did not test mattresses in person.