FEATURES & DETAILS: One Size Fits All: Easy to adjust: Whether you have a large or small head, long or short reach, our headband suits everyone. Its flexible design ensures a comfortable fit for all. Additionally, adjusting the string is effortless - simply roll it around the headband to achieve your desired length Compete in cash money competitions: Compete online from your phone with our app (iOS & Android) and win real cash money Boxbollen App is included: Use the built-in hit counter to challenge your friends and family in different game modes Improve focus, reflexes and body control: Put the headband on, start punching the ball and avoid getting hit. Stay focused while improving your eye-hand-coordination, reflexes and body control Move your body, make it sweat: A light cardio workout or high-intensity intervals, you choose! Boxbollen is your perfect training partner. Complement your other training such as running, boxing, yoga, weight training, basketball and other sports SET INCLUDES: Adjustable Velcro(R) headband Elastic string with soft ball Water-resistant carrying pouch QR code license to The Boxball App