The Bortle Scale measures the darkness of night skies and ranges from Class 1 (pristine, dark skies) to Class 9 (inner-city light pollution). This helps astronomers and stargazers understand how much light pollution affects visibility of stars, planets, and celestial events. 

• Designed as to be slightly relaxed with the hem falling right at the hip
• Sleeves are intended to hit at the mid to lower arm
  • If you're looking for a roomier fit, size up one size
• Machine wash cold with like colors, do not bleach. Do not dry clean. 
• Tumble dry gentle low heat or line dry, cool iron as needed.
• 100% Cotton

What you can do to help reduce light pollution:

• Swap out bright lights for reflective gear
• Prep camp before dark & skip the decorative camp lights
• Avoid using car headlights at your campsite
• Use red, amber, or yellow light/headlamps instead of bright white light
• Turn off outdoor lights when not in use