The Alamosa is Poncho’s long-sleeve performance flannel for anglers who want a shirt that reads like flannel but works harder around water. Poncho lists it as a medium-weight fabric for durability, with stretch for mobility and a softer hand for all-day wear. The fabric is also meant to wick moisture and dry fast.
Details are geared toward fishing: a built-in lens cloth, a sunglasses holder, and a hidden zippered pocket.
The useful choice in the range is fit. Regular is the roomier cut. Slim is closer without changing the feature set.