What Our Gearhead(R) Experts Are Saying:"This Jac-Shirt is a workhorse. The wool is warm but not bulky, and it still insulates when wet. The hidden-button pockets keep things streamlined, and it layers perfectly over a flannel or under a shell."We reach for the Jac-Shirt on crisp days when a flannel isn't quite enough but a full jacket feels like overkill. Its tightly woven 18oz Seattle Wool offers naturally breathable insulation that stays warm even when damp-ideal for foggy mornings, chilly commutes, and long days in the field. The midweight build hits that perfect balance between mobility and dependable protection. Dual chest pockets with hidden buttons keep essentials secure without catching on straps or packs, while button-adjustable cuffs and a traditional front closure nod to timeless workwear style. Rugged, warm, and remarkably breathable, the Jac-Shirt proves why wool overshirts remain a staple for all-season versatility.