Updated for those who demand more, The ONE^™ Shirt-Jac delivers lightweight warmth with a contemporary, snap-up design. Both wind- and water-resistant, our new shell fabric offers enhanced stretch and a modern look with a clean, matte finish and ripstop durability. Innovative AERO^™ KNIT insulation combines with woven underarm gussets to provide breathable airflow and to release excess heat. Made to move and built to last, there can only be ONE^™.