The Hydro Flask Wide Mouth Insulated Twist Cap is designed to help keep the contents of your Hydro Flask Wide Mouth 18 oz, 40 oz and 64 oz bottles sold separately at the optimal temperature. Designed to withstand everyday use, the rugged Wide Mouth Insulated Twist Cap is the world's first insulated wide mouth cap. NOTE: The Hydro Flask Wide Mouth Insulated Twist Cap will NOT fit Standard Mouth Hydro Flask bottles. WFC2
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