There is a particular kind of homesickness that arrives at four in the afternoon on an unfamiliar court, when the sun drops to the angle it never reaches at home and comes in from the side, and suddenly you cannot see the ball you have been hitting your whole life. It is not the heat that unsettles you. It is the geometry being wrong.
Which is the entire argument for a wrap frame, and the reason to understand what the word means before you buy. A flat-fronted pair of sunglasses sits across your face like a shopfront: it deals admirably with light arriving from directly ahead and does almost nothing about light arriving from the side, because there is an open gap at each temple where the world gets in.
A wrap curves with the head, following the line of the cheekbone and the temple, so the lens is still between you and the sun when the sun has moved round to your shoulder. It also keeps the wind and the grit out on a dry, blowing afternoon, and it keeps the frame closer to the face, which means less bounce when you run.
That closes the gap at the side.
These carry UV protection, which is the part your eyes will care about in twenty years even if you do not care about it today.
They walled the whole place in the seventeenth century and put the Puerta de Tierra through it as the land gate. They set Fuerte de San Miguel up on the hill with a dry moat and a drawbridge that is still in place.
San Francisco de Campeche is a city that has thought hard about what to do with an exposed edge.
Baluarte de la Soledad, once a bastion, now holds a collection of Maya stelae. Nothing here was left open on the side that mattered.
The light that beats you is never the light in front of you.
Buy on Amazon