Fluid replacement whilst training is vitally important and can improve your workouts immensely our sports and gym water bottle acts as a reminder to rehydrate yourself as you can track your fluid intake with the water measure running on the side of the clear bottle our usn water bottle is covered in a non slip material and designed to sit comfortably in your hand the usn water bottle is also free of the chemical bpa giving you a reliable fresh shaker our fantastic design is leak free