The 360-Degree Trainer Cup, designed for WIC families, features an automatic shrinkage leak-proof system, allowing children to drink sitting up or even lying down with ease. Its scientific self-locking valve opens when the child sucks on any part of the lid and closes automatically when not in use, ensuring no spills. Simply place their mouth on the rim, lift, lean back, and suck—their lips gently touch the silicone valve, naturally releasing water.