Onyx-13 ONYX‑13

Co. Mayo, Ireland

Built On
// No
Shortcuts. Est. 2026

Onyx‑13 is an Irish clothing brand.
We make one thing.
We make it properly.

First Drop August 13, 2026
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Limited. Drop 01.

01 Origin
Danny Dempsey, Founder — Arctic White Hoodie

Danny Dempsey. Founder. Co. Mayo, Ireland.

We are not a fashion brand.
We are not chasing trends.

Onyx‑13 was built from the ground up, with personal savings, a clear standard, and one question that refused to go away: why settle?

We are Irish. We source heavyweight 460GSM cotton. We embroider in Co. Mayo. We obsess over GSM weight, thread quality, label construction. Not because it makes good copy. Because it is the only way we know how to work.

Full Story

02 The Mark
Onyx-13 Celtic Tribal Bird Logo Celtic Tribal Bird
Created from scratch

The Celtic knotwork on the left chest was not sourced or commissioned. It was created from scratch. Drawn by hand. Built from nothing into something permanent.

Celtic knotwork has no beginning and no end. That is not coincidence. It is the point.

The name carries the number 13. Those who need to know, know.

03 The Standard

Every decision made against one question: is this good enough?
Both answers have always been the same.

460GSM Weight Heavyweight French Terry. The kind that costs more and lasts longer.
100% Cotton No blends. No shortcuts. Pure cotton from field to finished garment.
Hand Embroidered Celtic tribal bird. Embroidered in Co. Mayo. Not printed. Not transferred.
Made In Ireland Finished in Ballina, Co. Mayo. Irish craft.
04 Drop 01

One garment. Five colourways. Limited run.
Drop 01. August 13, 2026.

  • Weight460GSM
  • Material100% Cotton — Heavyweight French Terry
  • FitOversized
  • SizesXS — 2XL
  • Price€99
Onyx Black
Arctic White
Soft Pink
Lilac
Magnet

Full Product Details

Onyx‑13

For those that matter. Co. Mayo, Ireland — Est. 2026