Section

Materials & Fabrics

Fibers, weaves, knits, leather and membranes: what the term on the label means and how the material behaves in wear and washing.

Materials·Explainer·October 21, 2026·5 min
What KEEN.DRY Is: How the Brand Describes Its Waterproof Membrane, and Waterproof vs Water-Resistant vs Water-Repellent
A source-based explainer of KEEN.DRY, drawn from the brand's own February 10, 2020 explanation: an internal membrane described as a thin bootie that keeps water out while letting vapor escape, the brand's distinction between waterproof, water-resistant and water-repellent materials, its PFAS-free repellency treatment, and its own account of third-party flex testing to a 50,000-flex internal standard. All claims are attributed to KEEN as the brand states them.
Materials·Explainer·October 19, 2026·4 min
What Hemp Fabric Actually Offers: What Patagonia Says About Growing It, Blending It and Its 'Iron Forge' Canvas
An explainer based on Patagonia's own material page: why the brand says it grows hemp with little irrigation, how it blends the fiber with organic cotton, recycled polyester and TENCEL lyocell, what the 'Iron Forge Hemp' abrasion claim says, and where the brand's account stops. All claims are the brand's, not independent tests.
Materials·Explainer·October 15, 2026·4 min
What Coolmax Is: The Polyester Fiber in Darn Tough's Synthetic Socks, As the Brand Describes It
Coolmax is a brand of polyester engineered as a breathable, moisture-wicking alternative to wool. This explainer sets out what Darn Tough says about the fiber — how it is made, why the brand knits select Hike and Run socks from it, and the dated EcoMade recycled-content claim — with all comparisons to Merino wool kept as the brand's own position.
Materials·Explainer·October 10, 2026·4 min
Next-Gen GORE-TEX and the ePE Membrane: What 'PFAS-Free' and 'Reduced Carbon Footprint' Mean on the Label — As Gore Describes It
Gore describes some newer GORE-TEX products as built on an ePE (expanded polyethylene) membrane rather than the brand's classic expanded PTFE. On Gore's own product pages, that change comes with two tagged claims — PFAS-free* and reduced carbon footprint** — each carrying asterisked fine print. This explainer sets out, as Gore describes it, what the ePE membrane is, what those label terms do and do not guarantee, and how to check a specific product, with every claim attributed to the brand.
Materials·Explainer·October 7, 2026·4 min
Anatomy of a Pair of Jeans: What Levi's Own Glossaries Say the Denim Terms Mean — Weave, Rivets, Stitching and Rise
A brand-attributed explainer of the vocabulary of jeans construction, drawn from Levi's own pages: how the twill weave and warp-and-weft yarns work, what rivets, shank buttons, bartacks, topstitching, the J-stitch fly and the yoke are, and how rise is defined. Everything here is what the brand says, not an independent standard.
Materials·Guide·September 19, 2026·3 min
How to Care for Birkenstock Cork Footbeds, Leather and Suede: The Brand's Own Heat, Water and Cleaning Rules
BIRKENSTOCK's customer care page spells out how the brand says to treat cork footbeds, leather, suede, nubuck and Birko-flor uppers: avoid concentrated heat and prolonged soaking, re-seal drying cork edges, and clean the footbed with the brand's named products — with the brand's own caveat that any treatment can change the look and finish of the materials.
Materials·Brand program·September 12, 2026·4 min
What the GORE-TEX Membrane Actually Is: Gore's Own Explanation of ePTFE, and What the GUARANTEED TO KEEP YOU DRY Promise Is Tied To
A brand-attributed explainer of the GORE-TEX membrane: what expanded PTFE is, how Gore describes its microporous structure, what the laminate is, and which product ranges Gore ties its waterproof promise to — including the INFINIUM range the brand markets for drier conditions.
Materials·Explainer·September 12, 2026·5 min
Why Sock Makers Blend Merino Wool with Nylon and Spandex: What Darn Tough Says About Durability, Fit and '100% Merino' Claims
A 100% Merino wool sock sounds like the top of the range, but Darn Tough – a brand that knit Merino socks – argues otherwise. We walk through the brand's own explanation of yarn blends versus garment composition, why it adds nylon in high-wear zones and Lycra spandex for fit, and what its example fiber breakdowns (48/45/7 and 61/36/3) suggest about reading a sock's label. All durability and comfort claims here are the brand's, not independent test results.
Materials·Explainer·September 12, 2026·4 min
What Denim Weight Means — and Why Levi's Own Guides Disagree on the Categories
Denim weight is measured in ounces per square yard, but 'lightweight', 'midweight' and 'heavyweight' are brand-defined shorthand, not standardized terms. Levi's own Denim Dictionary and its Off The Cuff terminology guide draw the category boundaries differently. Here is what the measurement actually describes and how to read it.
Materials·Explainer·September 12, 2026·3 min
What Selvage (Selvedge) Denim Actually Is: Shuttle Looms, the Self-Edge, and Why It Costs More
Selvage denim is woven on old shuttle looms that produce a narrow fabric with a self-bound edge that cannot unravel. Nudie Jeans' own explainer describes how shuttle looms work, why the edge shows up on cuffed vintage hems, how to spot it on a new pair, and why the brand says it is more expensive — while admitting the edge itself does not make the denim mechanically stronger.
Materials·Explainer·September 10, 2026·4 min
What the Responsible Down Standard (RDS) Logo on Down Jackets and Bedding Actually Certifies
The RDS logo on a puffer jacket or duvet means the down inside was certified against animal welfare criteria — including a prohibition on live-plucking and force-feeding — with third-party audits and chain-of-custody tracking from the farm to the final product. Here is what the standard covers, what its page says it does not, and why it remains in use after Textile Exchange's December 2025 transition to the Materials Matter Standard.
Materials·Explainer·September 10, 2026·3 min
What the Responsible Wool Standard (RWS) Logo on Wool Clothing Actually Certifies — and How the Materials Matter Standard Transition Changes It
RWS is a voluntary standard from Textile Exchange covering sheep welfare, land management, social criteria and chain of custody from farm to the final business-to-business seller. It does not give shoppers farm-level transparency. Textile Exchange is transitioning RWS into the Materials Matter Standard, with effective and mandatory dates in 2026 and 2027. Here is what the logo means, what it does not, and how to check a claim.