The Womens Smartwool PhD HyFi Vest is a must-have midlayer piece for keeping your core warm. Made from a revolutionary new bi-component fabric, the PhD HyFi vest puts the comfort of Merino wool next to your skin and a smart nylon facing out. So you get all the benefits of Merino Wool, such as natural moisture and temperature management, odor control and breathability, while remaining wind resistant and far more durable against the hazards of the great outdoors. A draft flap runs down the length of the full front zipper to keep biting winds from slipping through. To prevent the top of the zipper from causing any uncomfortable abrasion, the PhD Hyfi Vest features a soft chin guard. Store your hands or small essentials in this Smartwool vest's zippered hand pockets. Get high warmth without the bulk with the Womens Smartwool PhD HyFi Vest.