Transparent PVC plastic. Lightweight and see-through makes it easy to see which glasses are inside.
Fits your various pairs of glasses perfectly. These cases are available for reading glasses, eyeglasses, and even sunglasses.
Snap-button closure. They close easily and remain closed. The clasp is just tight enough to stay shut but allows opening with one hand.
The ends and bridge (nose piece) support are hard plastic. The rest of each case is a softer plastic. They'll protect glasses from scratches, drops, and dirt, but not from being crushed.