Let’s first cover the similarities between the classic Sutro, Sutro S, and Sutro Lite sunglasses. Across all three models, you’ll find the same wrap-around design and proprietary materials. This means the same level of protection against the elements, built with an O Matter frame, Unobtainium Saddle Bridge, and PRIZM lenses.
Now, onto the differences.
The Sutro S differ from the classic Sutro in only one regard—size. One of the distinguishing features of the Sutros is their sheer size. With the Sutro S, Oakley dialed it back a half-notch for people with smaller head shapes. Nevertheless, you still get full-shield coverage with the Sutro S, since the curvature of the frames were reduced proportionally.
In terms of specs, the original Sutros are roughly a men’s L or women’s XL. The Sutro S, on the other hand, are about equivalent to a men’s S to M or women’s M to L.
Finally, the Sutro Lite sunglasses share the same dimensions with the classic Sutro. The difference here is in terms of function rather than construction. With the Lite, you get extra Unobtainium grip on the inside temples for added stability. Moreover, the absence of a bottom rim allows for better downwards visibility.