FFI Logo on left chest of all shirts.

From the Patagonia website:

• Made from an ultralight 52% nylon/48% polyester blend that dries in a flash
• Mechanical-stretch fabric allows for greater comfort and ease of motion while casting
• Two vertical zip-closure chest pockets; zippers are 100% plastic to prevent corrosion in salt water and humid environments
• 198 g (7 oz)