Smart Tea Infuser Bottle, 17oz Double Wall Vacuum Insulated Water Bottle Tea Tumbler with Strainer for Loose Leaf - Tea Infuser Mug 316 Stainless Medical Grade Steel --- Insulated Water Bottle greatly outperforms 18/8 food grade stainless steel in anti-oxidation and corrosion resistance. Anti-scald design Touching the lid of the cup lightly to display the current water temperature. Long Time for Holding Temperature Featured dual walls, premium coated copper on the exterior of the inner wall. High performance temperature retention, keep liquid hot up to 12 hrs and cold up to 24 hrs. PERFECT GIFT --- Tea infuser bottle unique tea separation design and functionality, make the tea bottle the perfect gift for any holiday like housewarming, father's day, mother's day, christmas, halloween, and more. Multiple Uses This tea infuser bottle can be used as a tea bottle/fruit infuser bottle, the filter can effectively filter tea leaves/fruit dregs, enhance the purity and taste of your drink.