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The Q36.5 Bullet Proof long-sleeve base layer is a new evolution in base layers for extreme cold conditions. The Bulletproof is designed to be worn between a traditional skin-contact base layer and an outer layer, offering maximum thermal protection with minimal weight. One of the main features of the Bulletproof is Q36.5’s proprietary Air Insulation: an ultra-light brushed mesh fleece that creates a surface capable of trapping a large volume of air (the lightest form of insulation in the world!) between the layers, while simultaneously increasing the contact area with the body. This facilitates moisture transport to the outside, keeping you dry for longer.