The Sirrus Henley is an Arc'teryx long-sleeve, ideal for everyday use around town and as a base layer during alpine hikes. It's made with a DryTech™ Stretch Double Knit fabric weave, which means its face has a soft and textured plaited cotton construction, while moisture wicking polyester partially lines the interior, helping it dry-out quickly. Arc'teryx designed the Sirrus LS in a regular fitting longer-length, which is ideal for layering or wearing on its own.