Premium titanium? Wonder what that is going to be now. More marketing foo like "X-Metal" which basically meant any old Ti alloy we could get our hands on: https://www.oakleyforum.com/threads/xmetal-what-is-it.119152/page-7#post-1968719 - andr3
I assume it’s because the Tailend Ti is made in Japan. That type of branding carries a “premium” tag. Japanese-made titanium in the eyewear industry is like “Swiss Made” for the horological industry.
Oakley bought a golf club factory for its X-metals in the mid ‘90’s. It was always gonna be made of consumer-grade materials, especially since eyewear made of titanium was a relatively newer thing back in the day; they certainly weren't gonna invent a new grade of Ti. While the industry has advanced enough these days where some brands use purer titanium (such as Leisure Society’s Pure Block Titanium), most of the high pricing these days is attributed to relatively expensive small batch manufacturing techniques (such as cold rolled titanium in some of Massada’s eyewear) or DMLS printing (such as what Oakley did with the Plantaris Ti and the MUZM X-metals).
Or at least that’s the spin marketing gives you so you pay more.