The IceBreaker Oasis Long Sleeve Crew Neck Running Top is an active base layer engineered with Bodyfit 200gm merino wool. This lightweight construction has great thermoregulation and moisture-management properties designed to help provide core body temperature stability, lower your heart rate and manage sweat effectively. Coverage from the elements is provided by a drop-tail hem. Featuring off-set shoulder seams to eliminate pack rub, and free seam flatlock stitching to reduce chafing.