The Nike Aeroloft Vest ($TBA) combines the right amount of insulation with plenty of ventilation to keep you comfortable on your run. Insulation is made from a blend of wool and synthetic, giving you enough warmth without weighing you down. Perforated ventilation in between rows of insulation lets your body breath so you don't overheat. It features wicking dri-fit fabric on the sides and shoulders, absorbing moisture and ensuring a great fit. The back has a reflective, zippered pocket that gives you space to store your important stuff, while helping maintain visibility in low light.