KONG Twistz High-Viz Ball’s vibrant, highly visible colors make this the perfect fetch toy for all outdoor environments, weather, and terrain. Bright colors contrast in tall grass, at the pool, in snow, and on dreary days, while glow-in-the-dark technology lights the way for fetching fun in the darkness of night. Durable material gives the Twistz High-Viz Ball a dynamic bounce and long-distance fetching action. Charge the ball under a lamp or in the sunlight for glowing fun!