Great piece- and Minerale fabric adds to it
All of Pearl Izumi's base layers use Minerale fabric that is made using fabric derived from volcanic minerals. The biggest benefit is the porosity of the fabric- It has more surface area than any other. More surface area= more places for sweat to bond to effectively spreading out the moisture and making for easy evaporation. This piece will wick moisture substantially faster than any polyester piece to keep you warm and dry.