Keller Sports is operates as an online merchant for sports equipment in Europe. The company provides tennis clothes, shoes, rackets, bags, strings, and balls; running clothes, shoes, and accessories; and fitness and training products, including clothes, shoes, trainers, and equipment for men, women, and kids. It also sells nutrition products, such as gels, drinks, and energy bars; and running belts and backpacks, bags, water bottles, accessories, dumbbells and free weights, Yoga mats, and heart rate monitors/GPS.