1.     Choose your favorite cup to use when running marathon, light, hang it on arm, convenient and confortable.

2.     Inside is high elastic anti slip material material, easy to put cup in.

3.     Inside has high quality anti slip design, can hold water cup tight.

4.     Arm band use high elastic and Velcro design, easy to use and convenient.

5.     Easy to clip sleev on and easy to un clip the sleev for water adding.

6.     Taiwan utility patent:M600583. Taiwan utility patent M604139,Germany utility patent:202020105228, Japan Patent NO.:3229564, Other country under apply.