ArcticShield Retain varies the heat level to give you warmth where you need it most, while still allowing you room to move - because it provides less bulk. A warm hunter is quieter, mentally focused, on the hunt longer, and more likely to be successful. Independent laboratory tests have confirmed that ArcticShield Retain captures greater than 90% of body heat.Specifications and Features: Durable polyester tricot outershell Polyester body lining Waterproof and windproof Retain Heat Retention Technology Side flex points Knee high 2-way zippered side gussets