I believe that there are no sport companies that start with the letter K.
Javelin, jockstrap and jump rope are pieces of sports equipment. They begin with the letter J.
Carts are golf sports equipment. Cleats are football equipment used in football, baseball and soccer.
Jump rope, jerseys, jockstrap, javelin, jack (auto racing) and jacket (skiing) are sports equipment.
* duck decoys * discus * drivers (golf)
Quiver is a sports equipment used in archery.
ankle weights ankle supports aerobic shoes arrow (as in bow and arrow for archery)
ankle supports (These are required to be worn in many youth football programs)