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long sleeve turtleneck jersey with windproof WindShell Carbon Underwear® protection that is breathable and thermoregulating in any weather condition. SIXS air Shield technology protects the torso from cold air in front. A thin layer of breathable windproof mer creates a micro air cushion that defends the body without causing the classic "greenhouse effect" that increases perspiration. The mock turtleneck collar protects the throat from sudden temperature changes and cool drafts. Ideal for outdoor sports.