The "Fun Lovin' Otter" shirt design was screen printed by Burly Shirts in the beautiful state of Maine, USA. Printed on a 100% cotton T-shirt. White ink on fatigue green shirt.

The exact brand/cut of T-shirt that this design is printed on is partly dependent on the size.  The vast majority of this shirt design is printed on the Next Level Men's Cotton Crew T-shirt, which is a 100% combed ringspun cotton fine jersey, pre-washed with a tear-away label.  This style runs a little small, and is a more fitted cut in the arms.

Small-2XL sizing in Next Level Cotton Crew:
Small: Chest 35-38", Length 28"
Medium: Chest 38-41", Length 29"
Large: Chest 43-44", Length 30"
XL: Chest 45-48", Length 31"
2XL: Chest 48-52", Length 32"

A few of the XL and the 2XL size are printed on the Hanes Nano Tagless Men's T-shirt, which is 100% cotton pre-shrunk lightweight jersey knit.
XL in Hanes Nano: Chest 46-48", Length 32"
2XL in Hanes Nano: Chest 50-52", Length 32.5"

Photographer: Ruff Studio, ME