From Patagonia:

Highly breathable, moisture-wicking and fast-drying running top for longer days on the trail when you want to look good and feel good. Fair Trade Certified™ sewn.

• Lightweight 100% recycled fabric with unique jacquard that allows for faster drying, wicking and breathability
• Soft, comfortable, next-to-skin feel without sacrificing performance during use
• Side vents for improved fit while you're on the move
• HeiQ® Pure odor control
• Reflective logo
• Fair Trade Certified™ sewn
• Made in Sri Lanka.
• 105 g (3.7 oz)
• 4-oz 100% recycled polyester jacquard jersey with HeiQ® Pure odor control and a wicking finish