Materials
What TR90 is, and why the frame does not snap
The material behind the flex β and how to keep a frame straight for years.
TR90 is a thermoplastic with a memory: bend it and it returns to shape instead of cracking. That is why it turns up in sports frames and children's glasses, and why every frame we sell is made of it.
Light enough to forget
A TR90 front weighs roughly half what the same shape weighs in acetate, and far less than metal. Over a working day that is the difference between marks on your nose and no marks at all.
The hinge does the other half
Our frames use an internal smart long spring hinge: the temple flexes outward past its normal stop and springs back. It grips a wider head without pinching, and it survives being folded a dozen times a day.
Looking after them
- Fold the left temple first β hinges wear evenly that way.
- Rinse under water before wiping. Dust on a dry lens is what scratches it.
- Never leave them on a car dashboard. Heat is the one thing TR90 does not shrug off.
- Use both hands to take them off; one hand slowly twists the frame out of true.
Do that and a ৳300 frame will outlast several far more expensive ones.
