18/8 stainless steel double wall construction, it’s also made with BPA-free materials, handle can fold, with lid as a cup, this insulated thermos is an ideal bottle to throw into your truck, work bag or travel with it, keeps liquids hot or cold drinks cool for up to 24 hours, 1.1QT- 34 oz, besides also have 47oz or 64oz reference HKH257 or email please.