Smooth and silky, the active light styled Icebreaker Sprint Short Sleeve Shirt for men is 23% more breathable due to an active air permeable mesh fabric back and side panel. Perfect for mountain running, biking, and all active sports, this all-purpose Merino wool top is fashioned with a warming mid-collar, eyelet side panel/underarm gusset, and convenient zip pocket at right side seam. The sleeves are short, but the feature list is long. This zip top has curved side seams.