You are at the sunglasses rack, holding your fourth pair in five minutes, and every one looks slightly off. The shape is close, but not quite you. Here is the secret the try-on shuffle never tells you: the right pair is not about the trend or the price tag, but about how the frame plays against the lines of your face. We have spent 95+ years on exactly this at Foster Grant, The Original American Sunglass Brand®. Match the frame to your face, and a pair of shades stops looking like an accessory and starts looking like it was made for you.

Before the fun of shapes, one thing outranks all of it. The American Academy of Ophthalmology says to pick sunglasses that block 99 to 100 percent of both UVA and UVB rays. [1] A UV400 label makes the same promise in fewer words, since it blocks 100 percent of the sun's UV. [1] Every Foster Grant pair clears that bar with 100% UVA-UVB lens protection, so you never trade style for safety.

Glare is the other half of the job. Polarized lenses, like the ones on the rose-gold Amrita ($22.95), cut the harsh light that bounces off water, roads, and car hoods, so colors look sharper and you squint less. Sort the must-haves first, then treat the shape as the fun part that is all yours.

Not sure which camp you fall into? Pull your hair back, face a mirror, and study the outline (not the details).

1. Round: About as wide as it is long, with soft curves and a rounded chin, so your cheeks are the widest point.
2. Square: A strong, angular jaw and a broad forehead of the same width, with lines that read straight rather than curved.
3. Oval: A touch longer than it is wide, with a gently rounded jaw and even, balanced features.
4. Heart: A wide forehead and cheekbones that taper down to a narrow, pointed chin.

The rule is contrast: pick a frame shape that is the opposite of your face shape (a boxy Geo Square against a round Harper sums it up). A soft round face borrows angles, and a strong square jaw borrows a curve. That is the whole trick.

Here is the cheat sheet, then the picks, and every frame below is a real Foster Grant style you can shop today.

Angles are your friend, because clean corners and a straight brow line give a round face the edges it is missing. Want a statement? The eight-sided Geo Square, from the Sofia Vergara x Foster Grant collection ($32.95), pairs a crystal-blue-and-tortoise frame with smoke-tinted lenses. It carries 100% UVA-UVB protection and a hard coating that shrugs off scratches. Men who lean classic can grab Micah ($32.95), a soft-touch black Acetate wayfarer whose smoky polarized lenses hold their line against a rounder face. Just skip the small round frames, since they echo your curves instead of fixing them.

A strong jaw already has plenty of structure, so let your frames bring the curves instead. Round and oval shapes take the edge off nicely. Harper ($16.07) is a round frame with a modern twist: white, rimmed in rose gold, with rose-tinted lenses and a soft pouch to keep them clean. Aviators work here too, and the gunmetal Galley ($16.99) rounds out sharp angles while its polarized lenses cut glare off the water. For a men's take, the tortoise Acetate Mystery Man ($22.95) swaps hard corners for an easy, slightly rounded line.

Balanced already? Lucky you, because you are the face shape frame designers dream about. Almost every shape works, so this is your cue to go bold. The tortoise Dempsey brings classic clubmaster style up to date ($23.07), and its smoke polarized lenses cut glare from water and snow while the browline shape suits your even features. Want drama? The black Jazmine aviators ($22.95) go big, with crystal-trimmed, smoke-gradient lenses. One rule still holds: keep frames from spilling past the widest part of your face.

A heart-shaped face is wider up top, so the play is to add some weight down low. Aviators are built for exactly that. The silver Dolly ($16.07) tapers to a rounded lower edge that offsets a narrow chin, and its hard coating handles scratches and knocks. Light, rimless frames do the same job from the other direction, and the barely-there Vera ($22.95) keeps its slim metal-and-plastic body out of the way so your features lead. Love an upswept look? A soft cat-eye like the purple Rita ($32.95) lifts the eye up and out, and its polarized lenses pay off on bright mornings.

Shape gets you most of the way, and a few small calls do the rest. Frame color is where personality shows: warm tortoise Acetate suits golden and olive skin, while cool gunmetal and silver flatter pink and neutral tones. Lens finish sets the mood too, since a mirror lens reads sporty, a smoke-gradient tint reads glam, and a rose tint keeps it soft.

Fit matters as much as looks, because a frame that pinches your temples or slides down your nose will bug you by noon. Rubberized nose pads (like the ones on Micah) keep a pair planted through a jog or a beach walk. Our sunglasses come in one size built to suit most faces, so if a pair sits level and the lenses cover from brow to cheekbone without touching your lashes, you have a winner. When salt or sunscreen film builds up, rinse the lenses under cool water first, because a dry wipe grinds grit straight into the coating.

Choosing sunglasses for your face shape comes down to one move: play the opposite. Round faces borrow angles, square faces borrow curves, oval faces borrow whatever they like, and heart-shaped faces borrow weight down low. Every pair here gives you 100% UVA-UVB protection at a smart price, so the only call left is the fun one. Ready to find your match? Browse the full sunglasses collection, or jump to the women's line or the men's line to shop your shape.

[1] American Academy of Ophthalmology — recommends choosing sunglasses that block 99 to 100 percent of both UVA and UVB rays, and notes that a UV400 label blocks 100 percent of the sun's UV.