The NWU parka fleece liner is an insulation component designed to be worn with the NWU parka and provide extra protection during cold weather conditions. When worn with the parka, it shall be attached to the parka shell via inside front slide fastener and sleeves inserted in the arm openings and secured by snap attachment assembly tab located at the inside bottom of each sleeve. The liner may be optionally worn as a stand-alone outer garment over the NWU shirt.

The NWU parka is intended for use by US Navy personnel when weather conditions dictate and as the outer layer protection when used during cold/wet weather operations.