Outbound half-zip is a top-seller for a reason. With proprietary mid-weight core sweater material and strategically placed stretch fleece panels to lock in your body heat, it's ready for whatever lies ahead, be it on the slopes or in the lodge. Our outbound half-zip is a top-seller for a reason. With proprietary mid-weight core sweater material and strategically placed stretch fleece panels to lock in your body heat, it's ready for whatever lies ahead, be it on the slopes or in the lodge.