The Aero LS Half Zip is designed to keep you comfortable and give a wide range of movement for high intensity sports. This shirt is ultra lightweight, naturally odor resistant, and breathable. It features a half zip for extra ventilation, set-in sleeves, contrast back neck tape and princess seams, flatlock seams, a feminine shaped hem, and an Icebreaker merino logo. 120gm Jersey 90% Merino Wool/10% Nylon. Machine wash.