The two main points of contact with sunglasses are the tops of the ears and the nose. Strike King figured out a good material for use here. I’m not sure exactly what these pieces are made of but they are pretty comfortable and have been durable so far.
This has typically been a weak point on shades I’ve had in the past. Either the nose pieces would be attached via a screw or adhesive and inevitably get loose or fall off, or the material would disintegrate or get really sticky over time. So far, this material still feels the same as the day I bought them. So that’s a big plus in my book.