Designed for comfort in motion, this is a first-layer crew for a range of high-output activities in cool conditions. An engineered polyester made with wicking fibres, Phasic AR II fabric provides outstanding stretch, UPF 40 sun protection, and thermal comfort. The streamlined fit lets you wear it as a base layer or standalone, thumb loops hold your sleeves in place, and low-profile seams and ergonomic patterning maximize freedom of movement and all-day comfort.