The T-shirt is made for mountaineering and climbing but works perfectly for every outdoor activity perfectly, regardless of the weather conditions, season, or intensity level. The fabric is an RWS merino wool/recycled polyester mix, which combines the thermal and odor regulating properties of wool with synthetics' great moisture transportation and durability. The T-shirt has a classic design with a round neck and a regular yet athletic fit. It works just as good underneath your mid and outer layer, as a top for active summer days.