What are calico-wrapped springs?

An individual coil wrapped in its own fabric pocket is a pocket spring.

John Ryan says budget models typically use spunbond polyester pockets, while premium construction may use calico.

Tom’s Guide says wrapped coils may be glued or sewn together into a support layer.

Typical builds include a steel coil core, woven or non-woven spring pockets, comfort materials and cover fabric.

The fabric lets each spring move independently while helping hold the spring system together.

Winston’s description says springs are individually encased in calico.

• Winston’s Beds says calico pockets are sewn shut.
• Vispring says hand-placed tufts secure the upholstery and spring system without synthetic foams or adhesives.
• Check the maker’s own construction description for the method used in that model.

Not every pocket-spring unit uses calico; John Ryan says spunbond polyester is typical in budget models, while premium construction may use calico.

• Tom’s Guide says pocket coils may be joined with glue or sewing.
• The source describes a construction as hand-tied with twine.
• Some foam-encased units replace outer coils with foam at the perimeter.

Tom’s Guide says isolated pocket coils dampen the transfer of movement across the bed.

Pocket coils may be joined by glue or sewing.

A pocketed-coil mattress may have wool, cotton, foam or latex above its springs; these layers set how plush the bed feels.

John Ryan says the cotton weave in calico pockets used in higher-quality mattresses allows air circulation; it also says pocket fabric affects breathability, durability and motion isolation.

In higher-quality calico-pocket mattresses, cotton weave allows air circulation, but air circulation alone does not establish whole-bed cooling. Sleepers also lie on covers, fillings, protectors and duvets.

Vispring says natural upholstery fibers such as wool, cotton, horsetail, cashmere, silk, bamboo and alpaca are selected according to each mattress’s character.

Tom’s Guide says a hybrid mattress typically has pocket coils buffered by foam, latex, memory or gel-infused material, and/or wool.

Vispring says comfort depends on upholstery, spring construction, selected tension and the divan beneath it.

Vispring says comfort depends on the upholstery, spring construction, selected tension and the divan beneath it.

• John Ryan gives typical pocket-spring examples of 1.28 mm for soft, 1.4 mm for medium and 1.6 mm for firm, while noting that variations exist.
• Thicker wire resists compression more and makes firmer springs; thinner wire compresses more easily for a softer feel.
• The Original Mattress Factory says 12.75-gauge wire is thicker than 15-gauge wire.
• A high-quality core can support many upholstery layers and still maintain proper support in a very soft mattress.
• BedGuide says heavier sleepers usually need firmer tension.
• Treat spring tension and top softness as separate details when comparing a mattress.

Spring count alone is not the best way to evaluate support quality.

• John Ryan says counts are quoted for king-size mattresses and lists spring height as a comparison detail; BedGuide defines count for one stated size, so compare the same size basis.
• A “5,000 spring” mattress may have only about 800 in the main core, so ask how many springs the headline count includes.
• The Original Mattress Factory says more turns spread weight across more wire and reduce coil fatigue.

A pocket-sprung core is only part of the mattress; soft layers above the springs provide comfort.

• Ask which UK size the count refers to and how many springs are in the main unit.
• John Ryan says spring counts are quoted for king-size mattresses, so confirm the size basis when comparing models.

Does calico mean vanadium steel?

Calico refers to the pocket fabric; Vispring’s example uses vanadium steel springs inside calico pockets.

Are calico springs always hand-tied?

Vispring says its springs are formed and nested by hand, but its description does not specify whether the springs are hand-tied.

Is every wrapped-coil mattress made with calico?

No, wrapped-coil mattresses are not all calico; John Ryan says spunbond polyester is typical in budget models, while premium construction may use calico.

A general description calls pocket coils fabric-wrapped without limiting the fabric to calico, and BedGuide says pockets may be woven or non-woven.

Are calico-wrapped springs made entirely of cotton?

No, Vispring identifies its own springs as vanadium steel.

We read 7 published pages from 6 sites (johnryanbydesign.co.uk, tomsguide.com, bedguide.co.uk, vispringla.com and 2 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.