Upgrade your Polar Bottle Sport cap, or personalize your bottle's color combos, with a Zipstream High Flow Cap accessory. Fits all 24oz and 20oz bottles. - High flow cap - Self-sealing valve - Spill proof - Removable valve for easy cleaning - Made in USA - Dishwasher and freezer safe - Fits all 12oz, 20oz and 24oz bottles - Phthalate and BPA free.