With synthetic insulation, precision tapered sleeves with gasket cuffs, and adjustable velcro closures, the S4 Tower Parka ensures you're warm in the coldest temps, without adding bulk. The S4 Tower Parka also features a unique dorsal vent which allows it to be worn over a body harness should your job require that. The dorsal D-ring is passed through and clipped in on the outside of the jacket so you can always stay warm while performing your job. This feature also helps prevent overheating your back while running heavy equipment or driving. If you want winter workwear that's durable, breathable, and suitable for any environment, you need the S4 Parka.