THE NORTH FACE. NF0A3KU4H2G. THERMOBALL VEST. URBAN NAVY.Whether you re putting up your tent or kicking back by the campfire this durable and highly packable vest will make sure you stay toasty-warm around the clock. The new bottleneck quilting pattern and ultralight ThermoBall insulation eliminate cold spots and provide an excellent warmth-to-weight ratio.