Perfect Solo training - This new evolution soccer kick trainer is perfect for solo training. Adjustable waist belt - belt strap is adjustable to fit waist sizes. Great football training aid for kids and adults. Adjustable stretchy strap - 4.5ft elastic strap stretches to 10ft. Perfect for altering the length the ball will kick out to and for adapting to different environments such as back yards.Flexible for different sized balls, fits ball sizes 3, 4 and 5. It can helps with developing skills like ball control, passing, touch and reaction. GET MULTI-ASPECT TRAINING - Shooting, passing, receiving, juggling, ball control, throw-ins, all of these training program only needs the solo kick trainer.