after trying out many different base layers i have finally found one i can wear on its own, under a t-shirt, fleece or any other item to layer it up. word of warning: read the label and do not dry on high! mine shrunk up but only about an inch or so... still completely wearable and awesome! perfect length as well... i am 5'6", 130lbs and the small fit perfectly. i wore this in cold temps skiing as well as on a warm sunny day and it was great for both!