Naturally, it's imperative that I have a warm, quality-made jacket or coat to layer over my winter sweaters, to help this otherwise cold-blooded creature survive the year's chilliest season.

Finally, when we added the jacket on top of the three existing layers, both of our swing speeds dropped. However, this decrease was less than 0.5 mph for both of us, which is negligible.

The layer features 3.8-ounce Polartec Power Grid everywhere but the chest and upper arms, where you have the same fabric but in a 6.9-ounce weight. It’s basically a base layer with a little more ...