InWELL Journal · 03

Fabric Insights

Buyer's guides on fabric weight, fiber choice and stretch performance — written for sourcing teams, not chemists.

Aug 19, 2026 · 3 min read

What Is 4-Way Stretch? Inside Spandex Blends

4-way stretch shows up on almost every activewear spec sheet, but few buyers know exactly how it's built into the fabric — or how to verify a supplier's claim before production.

Nylon vs Polyester for Activewear: What Buyers Should Know

Both fibers show up on activewear spec sheets constantly, but they aren't interchangeable. Here's how nylon and polyester actually differ on the things a sourcing team cares about.

How to Read GSM: A Buyer's Guide to Fabric Weight

GSM tells you how heavy a fabric is per square meter, but on its own it can't tell you how a fabric drapes, breathes, or holds up on the line. Here's what to check before you sign off on a spec.