We've been making gym apparel since 2010. In that time we've learned that much of what separates good gear from cheap gear is decided before anything gets sewn: in the fabric, the mill that made it, and the factory that puts it together.
Most of that never shows up in a product photo - so here's what goes on behind ours.
It starts with the fabric
Every product starts with samples, and plenty never see the light of day.
We wear them, train in them and wash them, again and again. If a fabric pills, fades, loses its shape or simply doesn't feel right, we move on and try something different.
We don't choose fabrics by buzzwords either. The right material depends on the job.
Posing trunks need stretch and recovery. A gym towel needs absorbency, softness and durability. A training shirt needs to feel good while you're moving and not shrink two sizes after repeated washing.
We choose the material that performs best for the product - then we dig deeper.
We don't take anyone's word for it
A fabric feeling good isn't enough on its own.
We want to know where it came from, what processes were used and what independent evidence sits behind the claims being made about it - so we ask for the paperwork.
Test reports, certificates, audit records, quality-management systems - whatever is relevant to that material and that part of the supply chain.
There's a big difference between someone telling you a product is "premium", "organic" or "tested" and being able to show independent evidence to back it up.
What independent verification actually tells us
Different standards answer different questions.
One of the standards we actively look for when sourcing textiles is OEKO-TEX® STANDARD 100, which focuses on testing textiles for harmful substances. Materials covered by the standard are laboratory tested against requirements spanning more than 1,000 substances, with stricter limits applied as the level of intended skin contact increases.
That matters to us for products designed to sit directly against the body, get sweated in or be repeatedly used against the skin.
Other recognised standards look at different parts of the supply chain.
GOTS can provide verification around qualifying organic textiles and how they are processed, while ISO 9001 relates to the quality-management systems used by manufacturers and processing facilities.
What all of this gives us is something valuable: independent evidence.
Why that matters when you're buying gym gear
It's easy to make two products look similar online.
We've had our gear replicated and copied plenty of times - sometimes they're so lazy they'll even copy and paste our product descriptions and images. When you're just looking at photos online, the products might look quite similar.
The differences often start appearing after the first few washes, when the fabric begins pilling, stretching or fading.
And when you're buying from an anonymous marketplace listing - or someone who has whipped up an AI-slop brand on their laptop while sitting in their underwear - these important details are often overlooked through inexperience and a general lack of expertise.
That's where Iron Tanks is different.
Why we are genuinely premium
There's almost always a cheaper fabric, or a cheaper factory to make it in. And there's almost always another way to shave a little more off the cost of making a product.
We're not interested in winning that race.
We'd rather put the money into better yarns, more consistent fabrics, better components, more sampling and suppliers who are prepared to stand behind what they make.
Sometimes the difference is obvious the moment you pick the product up - and sometimes it's a little more subtle.
You may never see the certificate behind a fabric, know how many samples we rejected, or realise that a cheaper material was available and we chose not to use it.
But those decisions are part of the product you're paying for.
Certification isn't a shortcut
A certificate doesn't make a badly designed product good.
It can't tell us whether a shirt has the right size grading and proportions, whether a pair of posing trunks has the right amount of stretch, or whether a towel still feels good after months of use. That's still on us.
We test those things the old-fashioned way: by using the products ourselves, washing them repeatedly and reworking them when they aren't good enough.
Independent standards don't replace product development - they simply add another layer of scrutiny to it.
What Fabric Standards means
In essence, it means the textiles used in our products are backed by relevant third-party testing, certification or audit documentation that we've reviewed as part of our sourcing process.
The exact verification differs depending on the material and the product, but the principle is simple: we ask our suppliers for independent evidence from third-party bodies, then we test those fabrics ourselves under real-world training conditions.
So you can train with confidence knowing that a lot of thought and care has gone into the fabric selection and development of our products - products our team use and wear day in, day out.