Please be aware that due to the flexible nature of the frame material lenses may pop out if the frame is purposely twisted or bent. Lenses can easily be pushed back into the frame. Please choose the recommended Polycarbonate or Trivex impact-resistant lenses for kids to avoid damage and breakage of lenses. Our flexible frames for kids are designed for optimal comfort and durability. Crafted from a single piece of soft flexible TR90 plastic there are no hinges or metal parts. The adjustable detachable strap keeps glasses securely in place. These oval glasses are sized for toddlers (ages 1-3). | Zenni Toddler Oval Prescription Glasses w/ Strap Black Bendable TR Full Rim Frame