Base layers like the Phase AR use different polyester yarns on the inside and outside of the fabric to keep you warm but let moisture evaporate quickly, enabling you to stay dry and comfortable all day. Whether you are doing an energetic climb or moving fast over the mountains, this Arcteryx base layer gives plenty of stretch and skin won't get irritated because the seams are nice and flat. Use as a first layer next to the skin and add a fleece, soft shell or down jacket depending on the weather.
For a great range of Arcteryx men's clothing, take a look at our range here
Cuff & Sleeves Configuration: