DOUBLE WALL VACUUM INSULATION — — Our stainless steel wine glasses with advanced technology keep your drink cold for up to 9 hours or hot for up to 3 hours.Even with hot drinks, the outer surface stays cool, ideal for on the go.Enjoy your favorite cold drink even in hot weather.18/8 STAINLESS STEEL — — Preserves the original wine taste, lightweight, lead-free and durable.Double vacuum insulated travel mug - rustproof, sweatproof, easy to clean.Ideal for on the go, without flavor transfer.Please do not steam sterilize the lid to avoid deformation.BPA FREE — — The leak-proof travel mug with vacuum lid and silicone ring ensures safe enjoyment without leaks.The lid features a newly designed sliding straw opening that makes drinking easier.When pouring hot drinks (> 60 ℃), open the straw opening slightly to prevent the lid from accidentally opening due to water vapor.PERFECT SHAPE — — Elegant and comfortable, the poleless design with a powder-coated finish provides added insulation, grip and a durable coating that won't wear or peel.Please note that the widest diameter of 9cm does not fit the universal car cup holder (8cm).