Leak-proof for mess free drinking; 80% of moms agree100% leak-proofFlexible, soft silicone spout is gentle on gumsMix and match Philips AVENT Bottle and cup parts. Compatible with all Philips AVENT bottles !#!amp!*! sippy cups (excl. Glass bottles !#!amp!*! my First big kid cup).Bpa-free and dishwasher safeNote: Purchase is for 2 x bottles