The 30-second answer One described 5-zone pocket spring system uses different spring stiffness across regions. Side sleepers may require a softer mattress when choosing firmness and often suffer sharp pressure points. In that described system, the 5-zone count is accompanied by a spring-stiffness description; mattress firmness is linked mainly to the comfort layer, while support is determined primarily by the core.
The described 5-zone pocket spring system uses different spring stiffness to support different regions.
Pocketed coils seen from above split into five zone bands, with thicker and thinner coil wire marking different spring stiffness from zone to zone zone zone zone zone zone pocketed coils seen from above different spring stiffness per zone Independent spring movement Ellomatt says each coil in its pocket-coil system compresses on its own.
Ellomatt says heavier areas, such as shoulders and hips , can sink without dragging the rest of the bed with them. For a specific listing, check how it describes coil compression. Spring wire specifications Coil wire diameter is one detail to compare beyond zone count.
One seller lists 1.8 mm as its coil gauge. Compare a listing’s wire specification with the zone count stated for the design you’re considering. Sources (2) The cited 5-zone spring design varies support across body regions.
A person lying on their side with the shoulder, waist and hip marked, above a zoned mattress cut open with its zones left unmarked, and a note to check the maker's zone map shoulder waist hip zoned mattress, zones not marked check the maker's zone map Intended support changes The cited system describes support in accordance with human anatomy.
The cited system uses springs with different amounts of stiffness. Check what support change the system description says its zones target. Measures considered in one study A review says the Wu, Yuan and Li study was the sole study it found to consider multiple measures together.
The measures were body pressure, back-surface contour, and spine alignment . Check whether the Wu, Yuan and Li study considers those measures together. Zoning in foam and springs Nolah describes zoning in its tri-zone foam, and the cited patent describes a 5-zone spring system.
Nolah’s tri-zone polyfoam has its firmest section in the middle for enhanced lumbar support. Compare whether the stated zones come from foam or springs with different stiffness. Sources (3) Uniform pocket support differs from zoned support: spring pockets can have a single stiffness level .
A pocket spring mattress cut open with identical coils all the way across, so the whole mattress has one stiffness level cover comfort foam identical pocket coils one stiffness across the whole mattress Uniform pocket springs Uniform pocket springs can use a single stiffness level across their spring pockets.
Check whether a listing says pockets have one stiffness level or different stiffness across zones. Compare listed spring details, not just the zone count. Sources (2) Side sleepers may require a softer mattress .
A side sleeper, a back sleeper and a stomach sleeper on mattresses, with the side sleeper pressing in at the shoulders and hips shoulders hips side back stomach Side sleepers Side sleepers may require a softer mattress.
People who weigh less than 130 pounds often suffer sharp pressure points and may require a softer mattress. Firmness is linked mainly to the comfort layer, so check that layer when comparing feel. Sources (2) Weight can change how the same mattress feels to different sleepers.
Two mattresses side by side, each with its own comfort layer, beside one king mattress with a different comfort layer on each half split king internal split Weight and firmness feel A heavier person is likely to feel the same mattress softer than a lighter person.
Compare how the same mattress feels for each person’s body weight. Firmness is linked mainly to the comfort layer, while support is determined primarily by the core. Partners with different body types A split mattress may be worth considering if partners’ body types differ entirely.
Compare each partner’s body type and position preferences. Check whether the difference fits the source’s “entirely different” condition. Different firmness for partners If your position preferences are entirely different from your partner’s, a split mattress may be worth considering.
Compare each partner’s preferred sleep position. Check whether the difference fits the source’s “entirely different” condition. Sources (1) Look beyond the zone count: firmness and support come mainly from different mattress parts .
A sleeper on a hybrid cut open: the comfort layers give under the shoulders and hips while the coils beneath flex and hold the body up, over a thin base foam comfort layers coil support base foam Comfort layers and firmness Firmness is linked mainly to the comfort layer.
Check comfort-layer details when comparing overall firmness. The mattress core primarily determines support. Firmness versus support Firmness links mainly to the comfort layer, while support comes primarily from the core.
Check the comfort layer for firmness details. Check the core for support details. Pocket-coil construction Ellomatt describes its pocket-coil system as individually wrapped , with each coil compressing on its own.
For Ellomatt’s pocket-coil system, compare its construction particulars rather than relying only on zone count. Check for a listed coil wire diameter; one seller lists 1.8 mm . Sources (2) A quick showroom lie-down is not the same as sleeping on a mattress night after night, and Casper’s trial starts on delivery.
A shopper lying on a mattress in a store, in the position they usually sleep in lie in your usual sleep position Showroom lie-down limits Repeated nightly sleep is different from a quick showroom lie-down.
Treat a showroom visit as different from sleeping on a mattress night after night. Compare a quick showroom lie-down with sleeping on the mattress night after night. Trial return timing Casper’s trial begins on delivery, and customers must contact the company within the trial period to start a return.
For Casper’s trial, mark delivery as the trial start . For Casper’s trial, contact the company within the trial period to initiate a return. Sources (2) Can a five-zone map count reinforced perimeter edges? The cited review does not say whether a 5-zone map can include reinforced perimeter edges, so check the product description for what its zones cover . The reviewer tests edge support by sitting or lying on the mattress perimeter and seeing how much it dips.
Sources (1) Can foam create zones without pocket springs? Nolah’s Tri-Zone polyfoam has its firmest section in the middle for enhanced lumbar support. The layer is listed in Original, Signature, Signature Hybrid, Evolution, and Evolution Comfort+ mattresses.
Sources (1) We read 8 published pages from 7 sites (patents.google.com, Sleep Foundation, ellomatt.com, PubMed Central study and 3 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.
Sources (8) JP About the author
Justine P.
Mattress answers writer
Justine P. is a French writer based in France who writes Nappedia's mattress answers. Each answer is built from published sources: brand help pages, buying guides and outside test results, each claim checked against its source and dated. Her goal: help you pick the right bed, or skip the wrong one.