[Product Information]

• The Wide Mouth Flat Caps are insulated to aide in keeping your Hydro Flask contents cold or hot
• Fits the 12 oz， 16 oz， 18 oz， 32 oz， 40 oz and 64 oz Wide Mouth Hydro Flasks
• Please note that the Insulated Flat Cap does not fit on the older style Wide Mouth flasks
• Convert your wide mouth bottle into the perfect thermos for coffe and hot beverages
• It never hurts to have extra lids!