Patagonia Activewear Tank top

This Patagonia tank top is ~10 years old. The original printed text on the inner back is completely faded and the tag is damaged and partially unreadable, so I am not sure what the fabric is. It feels like a very soft and durable synthetic that would be perfect for workouts or wearing in hot weather. Size small Bright, shiny red One minor snag on front, as pictured.