Great layer, perfect for skiing, biking, hiking, whatever you want it for. The weight is so little, it's like you aren't even wearing a layer. The fabric can either stretch around you, which boosts its wicking performance, or wear it a little baggy for comfort and still great performance. The fabric is comfortable, and not irritating, which is awesome after a long day on the trail. Go to layer under my Patagonia R1 Flash, and a Helly shell.