What is a defining factor of the temple design in riding bow temples?

The defining factor of the temple design in riding bow temples is that they curve around the head. This design is specifically aimed at providing a secure and comfortable fit, especially during physical activities or riding. The curvature helps to ensure that the glasses stay in place, reducing the likelihood of them slipping or falling off, which is essential when engaging in dynamic movements. The shape of riding bow temples allows them to contour closely to the sides of the head, enhancing stability and comfort for the wearer. This characteristic makes them particularly popular in sports eyewear or for individuals who are active in outdoor pursuits.

The other options address features that may not necessarily apply to the unique design focus of riding bow temples. For instance, while some temple designs may be straight and rigid, riding bow temples specifically utilize a curved design. Also, it is not accurate that these temples do not touch the earlobe, as the curve typically allows them to rest comfortably against the sides of the head near the ears. Lastly, the notion that they are only for adults does not hold, as riding bow temples can also be adapted for children's eyewear, making this design versatile across different age groups.