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The StretchCordz Long Belt Slider was improved for safety and comfort. Used for adding resistance to swimming the Long Belt Slider is StrechCordzs #1 in-water resistance product. It provides swim out and pull-back resistance to improve strength and stamina. Accelerate quicker strengthen the finishes of each stroke and improve your times. A proprietary embedded safety cord runs the full length of the tubing and acts as a limiter to help prevent over-stretching.