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- Bring a lightweight layer of insulation to your fitness practice with the Altitude Tracker Quarter Zip for men. Comfy enough for weekly wear, and packed with details that make it as strong as it is stylish. So you can take it beyond the gym too. It's made with a 4-way stretch fabric, which means it rebounds quickly to keep its shape. It has UPF 50plus sun safety and moisture-wicking properties to keep you cool and confident.