By Oliver Charles Harry - Founder and Creative Director at Ghini Como, Argegno, Lake Como
Quick facts: silk vs polyester
- Silk is a natural protein fibre produced by Bombyx mori silkworms, composed of fibroin and sericin; polyester is a synthetic polymer derived from petroleum, chemically designated as polyethylene terephthalate (PET)
- The global polyester market produces approximately 60 million metric tonnes annually, making it the most widely manufactured textile fibre in the world by volume; silk production totals roughly 200,000 metric tonnes per year, making it one of the rarest
- A genuine mulberry silk scarf at 14 momme retains its structural integrity and colour fidelity for decades with correct care; polyester fabric begins to pill, generate static, and lose surface quality within one to three years of regular use
- Silk's protein structure makes it naturally thermoregulatory, hypoallergenic, and moisture-wicking; polyester has none of these properties, as its polymer chain structure neither breathes nor responds to changes in body temperature
- The cost difference between a silk scarf and a polyester alternative reflects a genuine difference in the cost of raw material, production complexity, and longevity - not margin inflation
Silk vs polyester: why real silk is worth the investment
The comparison between silk and polyester is straightforward to make and harder to act on, because the price difference between the two materials is visible at the point of purchase while the performance difference takes months and years to become apparent.
A polyester scarf at £18 and a silk scarf at £75 look similar in a product photograph. They do not look similar after two years of regular use, and they never felt the same against skin. Understanding why requires understanding what each material actually is, not just what it looks like.
What polyester actually is
Polyester is a synthetic polymer produced through a chemical reaction between ethylene glycol and terephthalic acid, both derived from petroleum.
The resulting material - polyethylene terephthalate, or PET - is melted and extruded through spinnerets to produce continuous filament fibres, which are then woven or knitted into fabric.
The process is entirely industrial, requires no agricultural input beyond the petroleum feedstock, and can be executed at enormous scale at very low cost per unit of fabric produced.
Polyester's properties are a direct consequence of its polymer chain structure. It does not absorb moisture readily, which gives it reasonable crease resistance but also means it does not breathe. It does not respond to changes in body temperature.
It generates static charge from friction, which causes it to cling to skin and attract dust and lint. Its surface structure, when examined closely, consists of smooth cylindrical filaments that reflect light uniformly from a single angle, producing the flat, bright sheen that distinguishes polyester fabric from the more complex optical behaviour of genuine silk.
Polyester does not degrade in landfill within any human-relevant timeframe. It sheds microplastic particles with every wash - research published in Environmental Science and Technology found that a single wash of polyester fabric can release between 700,000 and 12 million microplastic fibres, which pass through sewage treatment and enter waterways.
As buyers become increasingly conscious of the terrible environmental cost that cheap 'fast fashion' polyester scarves have, the financial gap between them and 100% mulberry silk scarves becomes easier to stomach.
What silk actually is
Silk is a protein fibre produced by Bombyx mori silkworms, each of which spins a continuous filament of between 600 and 900 metres from two glands in its head as it constructs its cocoon.
That filament is composed of fibroin - a structural protein with a crystalline molecular arrangement that gives silk its tensile strength and characteristic smooth surface - and sericin, a water-soluble gum that binds the filaments together and is removed during degumming before weaving.
The properties that make silk categorically different from polyester are consequences of this protein structure. Silk's fibroin contains approximately 45% glycine by amino acid composition, which produces a crystalline arrangement that refracts light from multiple angles simultaneously - the prismatic, shifting sheen that polyester cannot replicate regardless of weave construction.
Silk's protein structure is chemically similar to human skin proteins, which is why it is naturally hypoallergenic and does not cause the irritation that synthetic fibres can produce in people with sensitive skin.
Silk is thermoregulatory - it responds to changes in ambient temperature and body heat, warming quickly to skin temperature and managing moisture without trapping heat. Polyester does none of these things.
A mulberry silk filament has a higher tensile strength-to-diameter ratio than steel at the same dimension. This is the structural reason why a well-maintained silk scarf at 14 momme remains in active use after twenty years while a polyester equivalent looks worn within a season.
The cost-per-year comparison
The price difference between silk and polyester is most accurately assessed not at the point of purchase but over the useful life of the product.
A polyester scarf at £18 that looks worn after eighteen months of regular use costs £12 per year. A silk scarf at £75 that remains in active use for ten to fifteen years with correct care costs between £5 and £7.50 per year. The silk scarf is the cheaper product measured correctly.
This calculation holds even before accounting for the qualitative difference in the experience of wearing each material daily - the thermoregulation, the feel against skin, the way a silk knot holds through the afternoon where a polyester equivalent slides loose by midday due to its smoother, lower-friction surface.
Environmental longevity versus short-term cost
Polyester's environmental impact extends beyond its petroleum origin. Its non-biodegradable nature means that every polyester scarf produced today will exist in some form for hundreds of years after it has been discarded.
The microplastic shedding that occurs with every wash represents a cumulative environmental burden that is not reflected in the purchase price.
Silk is a natural protein fibre that biodegrades completely. Its production is agricultural rather than petrochemical, and at the scale of a small artisan mill in Como, the environmental footprint per scarf is a fraction of that associated with industrial synthetic fibre production.
For a buyer who is making considered purchasing decisions - who shops Toast rather than fast fashion, who chooses quality over volume - the environmental calculus is as relevant as the tactile one.
The investment argument
The case for silk over polyester is not sentimental. It rests on measurable differences in thermoregulation, hypoallergenic properties, tensile strength, optical quality, environmental longevity, and cost-per-year of use.
Polyester is a legitimate material with legitimate uses in applications where cost efficiency and durability under industrial conditions are the priority.
As the fibre for a scarf worn against skin, knotted and retied daily, and expected to remain part of a wardrobe for years rather than seasons, it is the wrong choice - not because of taste, but because of chemistry.
Silk vs polyester: why real silk is worth the investment
The case for silk over polyester is not sentimental. It rests on measurable differences in thermoregulation, hypoallergenic properties, tensile strength, optical quality, environmental longevity, and cost-per-year of use.
Polyester is a legitimate material with legitimate uses in applications where cost efficiency and durability under industrial conditions are the priority.
As the fibre for a scarf worn against skin, knotted and retied daily, and expected to remain part of a wardrobe for years rather than seasons, it is the wrong choice - not because of taste, but because of chemistry.
Oliver Charles Harry is the founder of Ghini Como, a luxury silk scarf brand based in Como, Italy. He lives in Argegno on the western shore of Lake Como.
