Icebreaker Size Chart The Original Long Sleeve Half zip is one of Icebreaker's earliest designs, and has developed an iconic status as one of the most versatile sweaters a guy can own. This timeless classic is made from 320gm pure merino Jersey, a very soft, breathable, warm fabric that resists pilling, fights odor naturally, and looks great in every environment. The Original Long Sleeve Half Zip makes a great midlayer for skiing, a warm but breathable top for hikes in cool to cold weather, or a refined top for adventures in the city. Features: - Zip neck collar for temperature regulation - Rib at neck - 1/2 zip collar - Forward set side seams for comfort - Thumbhole cuffs - Center back length: 74cm / 29 1/4"", (size L) - Machine washable - 320 Heavyweight 100% Merino Wool