Several styles of performance sports jackets feature additional zippers that serve various purposes. Two helpful zipper features: -Two-Way Zippers. Some performance sports jackets, such as Nike's fleecy Standout Softshell jacket have a two-way front zipper that lets you adjust the fit if you are bending forward; this keeps the jacket from bunching up around your middle.
-Arm-Vent Zippers. Several sports apparel manufacturers, such as Gore-Tex offer performance jackets with zippered mesh panels in the armpit area. When unzipped, these panels provide additional range of motion and ventilation.