Prioritize a secure, comfortable fit and UV protection. Choose lenses and a wraparound frame that reduce wind and debris while staying light during long runs.

Lens material and tint for clarity and contrast, fit features (wrap, nose pads, temple grip), weight, and coatings like anti-fog or hydrophobic surfaces.

Look for lens interchangeability or photochromic lenses, polarization, and compatibility with hats or helmets, plus ventilation to prevent fogging.

For bright sun, choose darker lenses with UV protection; for low light, lighter tints or photochromic lenses help; for trails, ensure a secure wrap and anti-slip nose pads.