The SF Base layers have been through 3 stages of design and development with their Italian factory. They have have taken them to the highest point on planet earth, Everest, and they have endured countless hours of multi activity use by the ThruDark co founders.
Made from Polartec Power Grid and Scholler, a large front zip lowers to the sternum to allow venting when required and the highly breathable moisture wicking Power Grid technology helps regulate body heat during high output activities.
Due February 2020, from thrudark.com