YKK Vislon 2 Way Separating Activewear Zipper is an activewear weight zipper constructed of chunky, molded teeth that are lightweight yet strong and durable. These zippers have easy pulling sliders that pull to the bottom and open the zipper. The teeth will not freeze or corrode making it an excellent choice for outdoor wear. Use in jackets, sweaters, vests and craft items. Great in polar fleece. With two pulls, your project can zip both ways, if it's a jacket, you can zip it up, then open the bottom for ventilation. Navy Product Details