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Marmot's WarmCube Active Alt HB 1/2-Zip is a lightweight, high-performance pullover jacket built for unmatched warmth. The patent-pending WarmCube Active insulation is the star of this jacket, regulating our body temperature during high-output activities how and when we need it most. We like that the incredibly soft shell is made from recycled nylon, and we also like the four zippered pockets that provide plenty of space for our on-the-go essentials.