Double wall insulated Stainless Steel. Dishwasher safe.
- Made of 100% BPA-free ,food grade 304 Stainless Steel both outside and inside walls.
- Keep water/liquids hot up to 12 hours or cold up to 24 hours. A big bonus if you fit some ice cubes in it in hot summer
- 17 oz or 32 Oz is the prefect size keeping hydrated outdoors and fitting in your bag easily