Hey Elizabeth,This would do okay as a layer. Just as personal preference I like more Merino Wool for layering as it still insulates well when it's wet. Just food for thought.---------------------------------This would be a great baselayer. Turns out Polyester insulates when it is wet as well and still drys faster than wool. Also, there is 'elastane' in this piece which gives it great stretch. It is a great baselayer and a great stand alone piece for cool morning runs. Hope this info helps!