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The ProZero material is a flexible layer that can be worn from 30 to 55 degrees Fahrenheit at low to middle exertion levels, decreasing to 30 to -10 degrees at intense workout conditions.  The soft, highly elastic fabric is designed to fit like a second skin, never slowing you down or restricting mobility, while wicking perspiration away from your skin.  This is a great, highly versatile layer that allows you to adapt to different conditions and activity levels.  The raglan shoulder preserves you freedom of movement and a droptail hem means you can lean forward without baring skin.