The decision here is fit. Regular is roomier through the body. Slim trims it down without changing the feature set.
Truck Norris is Poncho’s short-sleeve fishing shirt in a lightweight, breathable fabric with stretch. It dries fast and includes built-in sun protection for long days outside. Details are aimed at keeping small essentials secure and close: a hidden zippered pocket and a sunglasses holder are part of the layout.
If you want a straightforward technical shirt for heat and sun, this covers it. If you prefer a heavier work shirt feel, this one is more about airflow and dry time.