With MrLifeHack's Silicone Sippy cup lids you no longer have to worry about your child spilling their drink. Our sippy cup lids are made of high quality BPA free silicone and fit well over most cup sizes (2.5"- 3" Diameter). They are easy to clean, dishwasher & boil safe. No need to carry bulky heavy bottles as our lids make most cups spill proof in minutes. Relax a little and let our products work for you!