The shake drinkers' dream, The Coldest Chug Lid has arrived. Compatible with all of your wide-mouth Coldest bottles, and built with reinforced locking mechanisms, this chug lid will persevere the toughest gym days with you. No more wearing your pre-workout to the gym, the clasp PLUS the push to release button makes sure that cap stays closed when shaking up your favorite powders. Simply pull open the clasp when done shaking and now the push to release button will make one-handed drinking a breeze. The chug lid blender attachment is optional to use, simply twist to remove and use only the lid.