What is lightweight wool? All tropical wool is lightweight, but not all lightweight wool is tropical wool. Wool is able to be woven less densely than cotton and still look professional. Traits associated with a good tropical wool usually include worsted yarns, a porous weave (for airflow), and perhaps a degree of wrinkle-resistance (as thinner fabric wrinkles while thicker fabric rumples). An excellent option for tropical use is a lightweight fresco.
Tropical wool has the comfort of linen but without the wrinkles. The comfort of linen is derived in most part because it absorbs sweat. At the same time most linen jacketings do not have weave porosity to the same degree as a lightweight fresco.