The Halo 5.0 top from Bomber Gear is made of Polartec Power Dry material, which isn’t too bulky and allows the top to fit snugly against your body. In fact, many find that the Halo is so warm that a midlayer isn’t even necessary, unless you’re going to be experiencing freezing temperatures for prolonged periods.
There are thumbholes to ensure the Halo’s sleeves stay where you need them to in order for you to keep warm. Also, the material features four-way stretching capabilities to allow for a good range of movement without constriction.
While it’s perfect for when temperatures drop below freezing, any warmer than that and you’ll likely become a bit too warm. Hiking rigorously while wearing the Halo, even in cold weather, will actually cause you to sweat, potentially stinking up the fabric over the course of a few days.
At $70 (available now for $42 on Bomber’s website), the Halo is an affordable, reliable baselayer for when the temperatures drop into the teens, but if you’re not facing such extreme conditions, then the Halo may be overkill.