Nuby’s BPA FREE No Spill™ Insulated Cool Sipper is perfect for transitioning children to open cup drinking! The cup’s soft silicone rim features No Spil Touch Flo™ Technology that activates as soon as your child applies a little pressure to the silicone spout. No Leaks , No Spills, No Mess! The one piece soft silicone rim, is easy to use, easy to clean & easy to assemble, unlike other cups that have lots of small parts to fit together. All Nuby™ cups are supported by Dr. Grace Yum paediatric dentist who recommends soft silicone spouts and straws to help protect emerging teeth.