You will know quality when you hold it!! Made from 18/8 stainless steel, and measuring window made of Tritan™ plastic. **Hand wash and UV sterilise ONLY** Boasting the benefits of * durability * easy to clean * reducing exposure to microplastics and endocrine disruption * bacteria resistance! The brushed stainless 18/8 steel leaves no metallic aftertaste – just watch how fast this bottle becomes the go-to bottle of choice for your little person. To properly care for this bottle, we ask that you don't fill it with boiling water, boil the bottle itself or use a steam steriliser.