This is the sport cap, and it is also called flip top cap. We have many kinds of sport cap. The size has 28mm,30mm,38mm. The sport cap with double theft ring. The sport caps contains a removable pulling ring. As the sport cap material, the beverage bottle cap body material is PP, and the cap spout is PE. The sport cap not only can fill the cold water but also fill the hot below 85℃. The plastic sport cap is popular for sports drinking bottles.