The Arc'teryx Calvus Cap is a lightweight ball cap for mountain training. Move fast and get a little face and head protection from the sun. The Spacermesh; headband wicks moisture while the Socora; fabric allows air to move through. Adjust the stretch closure strap as necessary with the quick release buckle. Features of the Arcteryx Calvus Cap Sweatband, and a stretch closure strap with adjustable quick release buckle Socora face fabric has a DWR coating A lightweight, Highly air permeable, gridded knit mesh with wicking properties for moisture management Socora 105g/m2 Light taffeta weave with 2-Way mechanical stretch properties and a DWR (durable water repellent) finish to repel moisture