How we picked
Coveragefirst, because that is the protection argument. A true wraparound shield blocks wind and debris from the sides, where a casual frame lets it straight in — which is why the wraparound pick is here despite looking out of place off the bike. Lens spec second: UV400 as a floor, polarization as a strong preference for glare off wet roads. Retentionthird — sunglasses that slide down a sweaty nose get pushed up all ride and eventually get left at home. Then wearability, because the best pair is the one you actually put on. We have not worn these through a season; here is exactly what we do instead.
Wraparound or casual frame?
Wraparound is the correct engineering answer: maximum coverage, minimum wind ingress, and lenses shaped to follow your field of view when you are leaned forward. If you ride fast, ride in traffic, or ride somewhere dusty, buy the wraparound. Casual sport frames are the pragmatic answer for upright e-bike riding at moderate speed, where wind blast is lower and you would rather not change glasses to walk into a shop. Most e-bike commuters are genuinely better served by a good casual sport pair they wear all day than a race shield they leave in a drawer.
Polarized lenses: one caveat worth knowing
Polarization is excellent for cutting glare off wet asphalt, painted lines and the hood of the car in front. It has one real downside on a bike: polarized lenses can make some LCD screens hard or impossible to read at certain angles, which matters if you run a bar-mounted phoneor a display for navigation. Tilt your head and the screen can black out. If you navigate by screen constantly, a non-polarized tinted lens avoids the problem entirely — and if you ride into dusk, remember a dark lens is a liability once the sun drops, which is when your lights take over the job.