Made of thermoplastic elastomer (TPE) with a wide range of flexibility. The lid stretches to allow an exact fit to the shape of the bottle opening. At the same time, it is strong enough to ensure an adequate seal. TPE is a material that does not deform up to a temperature of 120°C, which allows the lids to be washed in dishwashers. The lids do not contain phthalates or BPA. Fits 0.3 l, 0.5 l and 0.8 l Retap bottles.