Made of ultra clear borosilicate glass (not plastic), unlike the plastic tumbler, this one is good for cold drink or hot drink. No worry of BPA or plastic taste * Unique double wall structure keeps hot drink hot and cold drink cold. * Removable stainless steel strainer keeps loose tea in bottle. Spill proof lid made of ABS engineering plastic, no BPA worry. Works perfectly with Sun"s Tea Deep Infuser (sold seperately) for powder herb tea brewing or flavor infusing. * Perfect to use in home, office or car. Glass body is dishwasher and microwave safe. * 6 month warranty available, see warranty info at manufacture web site