Tempest Duty JacketMeet a history making jacket: The Tempest Duty. 5. 11's introductory Next Level Uniform jacket is also the most waterproof and breathable we've ever made. The waterproof shell is to increase wearer safety, while the traditional Ike Length design provides easy access to your duty belt.. For incredibly lightweight warmth, we combined patented Bio Heatsol technology (which emits heat and infrared waves through your body) with a silver patterned lining