What is the difference between Delta AcE Plus Gen.2 Jacket and AcE Winter Combat Shirt?

Both products are intended for active use in extreme cold. However, one is a jacket with a full front zipper and the other is a combat shirt. Each is compatible with additional gear (i.e., plate carriers and backpacks). Also, the AcE Gen.2 Winter Combat Shirt is the more comfortable of the two, while the Delta AcE Plus Gen.2 Winter Jacket’s long zipper makes it easier to put on and take off.