22.0 Mag/Arcsec² T-Shirt | Umbravoid
22.0 Mag/Arcsec² T-Shirt | Umbravoid
Sky quality has a number: magnitudes per square arcsecond. A pristine wilderness sky reads around 22 — the darkness where the Milky Way casts shadows and thousands of stars crowd the view. Your backyard probably reads far brighter. '22.0 mag/arcsec²' is a quiet flex for the dark-sky devotee who measures their nights with a sky-quality meter and chases that perfect Bortle 1 reading. For stargazers who know exactly how dark their favorite site really is. A premium tee for the data-driven observer. 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.