Fabric & construction
What the AIRism label actually says — the benchmark we build against
Key takeaways
- The two AIRism low-rise boxer briefs we bought in Vietnam do not share one composition: the black is labelled 88% polyester and 12% elastane, the grey 89% polyester and 11% elastane.
- Both labels give the same waistband composition: 90% nylon, 10% elastane.
- Both labels declare recycled polyester content, and the declared share differs by colourway — 34% on the black, 47% on the grey.
- The size XL label states a waist range of 92–100 cm, which is the range our own provisional size chart currently mirrors.
- The printed retail price on both packages was 199,000 VND, and both were made in Vietnam.
- FEELAFTER is not affiliated with UNIQLO or Toray Industries and has no access to AIRism technology. This is a published benchmark, not a supplier relationship.
What is AIRism?
AIRism is UNIQLO’s brand name for a family of synthetic innerwear fabrics. The packaging of the garments we bought states that AIRism for men was developed jointly with Toray Industries, Inc. It is a fabric brand, not a single fixed material.
That last point matters more than it sounds. Because AIRism covers a family of fabrics rather than one specification, two garments carrying the same AIRism name can be knitted from different blends. We did not expect to find that inside a single style, in a single store, on the same day — but we did.
What the labels say, exactly
On the two AIRism low-rise, no-fly boxer briefs we bought, the body compositions differ by colourway — 88% polyester and 12% elastane on the black, 89% polyester and 11% elastane on the grey — while both waistbands are labelled 90% nylon and 10% elastane.
| Label field | 09 Black | 06 Grey |
|---|---|---|
| Body | 88% polyester, 12% elastane | 89% polyester, 11% elastane |
| Waistband | 90% nylon, 10% elastane | 90% nylon, 10% elastane |
| Recycled polyester declared | 34% of the polyester | 47% of the polyester |
| Waist range (XL) | 92–100 cm | 92–100 cm |
| Printed price | 199,000 VND | 199,000 VND |
| Made in | Vietnam | Vietnam |
| Style | Low rise, no fly | Low rise, no fly |
Why would two colours of the same style differ?
We do not know, and we will not guess in public. The honest answer is that dye chemistry, yarn sourcing, production year and factory all vary between colourways, and any of them can change a declared blend by a percentage point.
The grey package was marked as a 2025 production year and the black as 2026, which is the most obvious candidate: a specification that moved between runs. What we can say with certainty is only what the labels say.
- Both are majority polyester with elastane for stretch — the same family of fabric.
- Both use a nylon-rich waistband, which is a different material from the body.
- The declared recycled content differs by 13 percentage points between the two.
What the size label tells you about fit
The XL label states a waist range of 92–100 cm, which tells you these are sized by waist measurement rather than by trouser size — so a tape measure, not your jeans, is the right way to choose.
Our own provisional chart currently mirrors these ranges, because the benchmark garment is the one we are developing against. It will be replaced by a measured FEELAFTER chart after fit testing, and we will say so on the page when it changes.
| Size | Waist (cm) | Waist (in) |
|---|---|---|
| S | 68–76 | 27–30 |
| M | 76–84 | 30–33 |
| L | 84–92 | 33–36 |
| XL | 92–100 | 36–39.5 |
| XXL | 100–108 | 39.5–42.5 |
Why we publish our benchmark instead of hiding it
Because the honest version of our origin story is that a competitor’s product set the standard we are trying to meet, and pretending otherwise would be the first lie on a site that is asking people to trust an unfinished product.
FEELAFTER started with a pair bought in Japan and a regret about not buying more. The feeling turned up again on a shelf in Vietnam, in the garment described above. We are an independent brand with no affiliation to UNIQLO or Toray Industries, no access to AIRism technology, and no licence to their fabric. What we have is a clear target: earn the same reaction with our own product.
- Benchmark what the label claims — done, and published above.
- Develop our own fabric to the same silhouette and hand-feel — in progress.
- Publish our verified composition and measured chart before we take a single order — pending.
- Publish wear-test results with the method attached, rather than adjectives — pending.
Frequently asked questions
What is UNIQLO AIRism made of?
On the two low-rise boxer briefs we bought in Vietnam, the body is labelled 88% polyester with 12% elastane (black) or 89% polyester with 11% elastane (grey), and both waistbands are labelled 90% nylon with 10% elastane. AIRism is a fabric brand covering several materials, so other AIRism garments will differ.
Are AIRism boxer briefs good?
We are not a neutral party — the product is our benchmark, and we are building a competitor. What we will say plainly is that the pair bought in Japan is the reason this brand exists, and we have not run any controlled test that would let us rate it objectively.
Is AIRism better than cotton?
They behave differently rather than one being better. Fine polyester and nylon knits move moisture along the fibre and dry quickly; cotton absorbs moisture and holds it, which feels cooler at first and heavier later. Which you prefer depends on heat, activity and how long you wear a pair.
Is FEELAFTER affiliated with UNIQLO or Toray?
No. There is no affiliation, licence, partnership or endorsement. We reference the product by name because it is the benchmark we develop against, and we publish that relationship openly.
What size AIRism boxer brief should I buy?
Measure your waist where the band will sit — low, across the hips — and match it to the printed range. The XL we bought is labelled 92–100 cm. Do not size from your trouser size, which is cut differently by every brand.
Where did these numbers come from?
From photographs of the packaging of two garments bought at retail in Vietnam in September 2026, transcribed field by field. It is first-hand but small: two garments, one market, one moment in time.
Where these numbers come from
- Label transcriptions
- Photographs of the packaging of two UNIQLO AIRism low-rise boxer briefs (09 Black, 06 Grey, size XL) bought at retail in Vietnam, September 2026. Fields transcribed: body composition, waistband composition, recycled content, waist range, printed price, country of manufacture.
- AIRism development attribution
- Stated on the packaging of both garments: AIRism for men was developed jointly with Toray Industries, Inc.
- FEELAFTER size chart
- Provisional and derived from the benchmark garment’s labelled ranges. Not yet validated by our own fit testing.
The product behind these guides
The Everyday Brief
Low-rise, no-fly, black, sizes S–XXL. In development — the specs we’ve confirmed and the ones we haven’t are listed on the product page.
Want to know when it’s real?
We’ll email you once, when The Everyday Brief goes on sale. Nothing else.