· Engineered with exact dimensions to Perfect Compatibility with NUK Learner Cup and Active Cup models, these silicone spouts adapt seamlessly for easy drinking, ensuring a great fit for your little one''s favorite cup.· Patented 360° rim seal + dual valve system withstands 5psi pressure (simulated toddler squeezing). Lab-tested through 10,000+ tilt cycles – zero leaks during stroller rides, car trips, or backpack storage.· Breastfeeding-Like Softness: Designed with ultra-soft, flexible silicone, these nipples mimic the natural feel of breastfeeding, making bottle feeding a cozy bonding experience. The gentle ripple texture soothes tender gums while the ergonomic shape supports proper oral development.· Stress-Free Feeding Anywhere: Our Silicone Spout Bottle Nipples advanced airflow system prevents colic, spit-up, and gas, making it perfect for on-the-go parents. Whether it's a late-night feeding or a quick bottle in the car, this design ensures a smooth, mess-free experience every time.· With its easy-to-detach design and dishwasher-safe convenience, this silicone spout lets you spend less time scrubbing and more time enjoying those precious moments with your little one. Because every minute saved is a minute gained for snuggles and smiles.