Bortle 1 Or Bust Scale T-Shirt | Umbravoid
Bortle 1 Or Bust Scale T-Shirt | Umbravoid
The Bortle scale runs from 1 (a pristine, star-drenched wilderness sky) to 9 (inner-city glow), measuring how dark your night truly is. This Scale edition puts the whole gradient on display — a badge for anyone who chases Class 1 nights and treats light pollution as the enemy. For dark-sky travelers who drive hours to escape the dome of city light and stand under a sky their grandparents would recognize. A premium tee for the Bortle-obsessed. Available in 7 sizes (S–4XL) and 10 colorways.
- 100% soft ring spun U.S. cotton fabric & cotton threads
- Proud member of the U.S. Cotton Trust Protocol
- OEKO-TEX certified low-impact dyes
- Salt free clean pigment dye colors
- Plastic-free packaging — polybags removed on all colors except White
All of our shirts are shipped directly from the United States. Orders are processed within 1 to 2 business days and 4-6 days of delivery
- The standard shipping fee is $5.99
- All orders over $99 is free shipping
Organic Cotton
GOTS certified. Grown without pesticides. Soft, breathable, built to last decades.
Colorfastness
Water-based inks cured at 320°F. Wash after wash, the design stays as sharp as the night sky.
Peer Reviewed
Every design is verified against current astronomical data. Coordinates are real. Objects are real.
Made in USA
Produced in the United States. Shorter supply chain, lower footprint, faster delivery.