SILICONE - Transparent and hygienic silicone, tasteless and odourless, does not age. Product Description The Evolution line of feeding bottles is dedicated to DEMANDING AND STYLISH mums who choose nothing but the very best for their child Thanks to the special shaped bottle angle, the teat stays full of milk, reducing the swallowing of air. Dual anti-colic action for a constant, peaceful feeding The anti-colic valves ensures regular milk flow, reducing the risk of colic BPA free