Titanium is strong, durable, corrosion-resistant metal, ideal for thin frames. It’s 40% lighter than other metals, which can eliminate headaches that come from wearing heavier frames. It can feel like you’re not even wearing glasses at all. Titanium is also hypoallergenic, eliminating negative reactions on the sides of your head and the bridge of your nose. The malleability of titanium means that frames, if bent, will revert to their original shape. Therefore frames made of metals like titanium are popular among athletes who tend to drop their eyewear. Although titanium is a silver-gray metal, frames come in a variety of colors.
Beta titanium is an alloy of titanium that includes aluminum. This makes them cheaper than 100% titanium frames and also more flexible.