Sunglasses for Heart Shaped Face: Buy by Temple Width, Not by Shape Name
1. The answer first
What decides whether sunglasses stay wearable is size, bridge fit, and lens height, in millimetres: the front must end at your temples, the lens height in the four models checked here runs from 41 mm to 50.1 mm, the temple arm in those models runs from 135 mm to 150 mm, and the bridge, 14 mm to 22 mm in those models, decides whether the pair slides down your nose (ray-ban.com and costadelmar.com, verified 2026-11-12). A wearer on the square-face page makes the same point in one line, that shape alone does not settle fit, and the full sentence lives there: sunglasses for square face.
The three pages at the top of the search give you no number to buy by. One is a shop collection that lists prices and counts. One lists shapes and prices. One gives a single 52 mm note for one model and no source for it. That is the whole gap found on 2026-11-12: no page gives a heart-face sunglasses size rule in millimetres with a source domain and a verification date. So the buyer is left to order, try, return, and order again.
That loop is what the wearers describe. "my current sunglasses are basically impossible to wear for long" (r/EyewearEnthusiasts, t3_1wt30by, 2026-09-29). "got another pair delivered this week and had the same reaction" (r/ConsumerAdvice, 2026-09-30). The pair arrived. The pair went back. The reason was never named on the page that sold it, because the page never printed a number the buyer could check before ordering. This page names the numbers that were checked, and it names the one number that was not published anywhere it looked.
2. Measure your face: three numbers, one tape
Measure three numbers with a flexible tape before you look at a single model: your temple width, your cheekbone width, and the distance from your brow line to the top of your cheekbone.
Stand in front of a mirror and look straight ahead. Put the tape across your temples at brow height, from the outer edge of one temple to the outer edge of the other, and write the number down in millimetres. That is your temple width, and it is the only number the front is compared with. A front that ends past that line is too wide for you. A front that ends short of that line is too narrow for you. No shape name changes that comparison.
Move the tape down to your cheekbones and measure straight across from one outer cheekbone edge to the other. Write that number down next to the temple width. On a heart-shaped face the temple number is the larger of the two. The gap between them is the taper the lens has to sit inside without adding width at the top or weight at the bottom.
Hold the tape vertically from your brow line down to the top of your cheekbone and write that distance down. This is the vertical room your lens has. A lens taller than that room will sit on your cheek when you smile. A lens much shorter than that room will leave your cheekbone bare and the frame will read as a strip across your forehead.
This measurement method is this page's criteria (faceshapelens.com, 2026-11-12). It is not an industry standard. No published face-width interval for a heart-shaped face was found on the Warby Parker guide checked on 2026-11-12, and none is claimed here. The three numbers above are yours, measured once, and every check below uses them.
3. Size determination: the published intervals, and the missing one
Use the published intervals as the outer bounds, then narrow them with the four models in the table below: lens width 40 mm to 60 mm, bridge width 14 mm to 24 mm, and temple length 120 mm to 150 mm (warbyparker.com, verified 2026-11-12; page updated 2026-04-02).
"You can first check the size online" (r/ConsumerAdvice, t3_1wu0wiq, 2026-09-30). The online check is the three printed numbers in the table below: lens width, bridge width, and temple length. The in-hand check is the front-to-temple line in section 7.
| Model | Lens width | Bridge width | Temple length | Lens height | Total front width |
|---|---|---|---|---|---|
| Ray-Ban Aviator RB3025, 58-14 | 58 mm | 14 mm | 135 mm | 50.1 mm | not listed |
| Costa Mainsail L, 55-18 | 55 mm | 18 mm | 136 mm | 42.9 mm | 136.2 mm |
| Ray-Ban Clubmaster RB3016, 51-21 | 51 mm | 21 mm | 145 mm | 43.9 mm | not listed |
| Ray-Ban Wayfarer RB2140, 50-22 | 50 mm | 22 mm | 150 mm | 41 mm | not listed |
The three Ray-Ban rows were read on ray-ban.com on 2026-11-12. The Aviator row reads 58 mm, 14 mm, 135 mm, and 50.1 mm. The Clubmaster row reads 51 mm, 21 mm, 145 mm, and 43.9 mm. The Wayfarer row reads 50 mm, 22 mm, 150 mm, and 41 mm. The Costa row was read on costadelmar.com on 2026-11-12. The Mainsail reads 55 mm, 18 mm, 136 mm, and 42.9 mm, with a frame width of 136.2 mm.
Across the four rows, the lens width runs from 50 mm to 58 mm, a span of 8 mm, computed as 58 mm minus 50 mm. The bridge runs from 14 mm to 22 mm, a span of 8 mm, computed as 22 mm minus 14 mm. The temple length runs from 135 mm to 150 mm, a span of 15 mm, computed as 150 mm minus 135 mm. The lens height runs from 41 mm to 50.1 mm, a span of 9.1 mm, computed as 50.1 mm minus 41 mm. Those four spans are computed from the numbers in the table, and each input carries its source in the row above.
The total front width is not listed for the three Ray-Ban models on ray-ban.com, checked 2026-11-12. It is listed for one model in the table: the Costa Mainsail publishes a frame width of 136.2 mm (costadelmar.com, verified 2026-11-12). The Warby Parker guide checked the same day also lists no total frame-width range. So this page gives no total-width interval, because only one of the four models publishes a front width, and one value is not an interval. Do not add two lens widths and a bridge width to make one: a front width is a measured number, not a sum. The total-width check therefore happens in the hand, in section 7, against the temple width you measured in section 2.
This page's criteria for the front is a line, not an interval (faceshapelens.com, 2026-11-12). A front passes when its outer edge sits flush with your temple line in a front-on mirror, with no overhang past the temples and no gap short of them. A front that overhangs adds width exactly where a heart-shaped face is already widest. A front that falls short leaves the temples bare and makes the face read wider than the frame.
The Wayfarer row in the table was already published on the oval-face sunglasses page, where it serves as the shallow-height anchor at 41 mm. It is used here only as that anchor, not as a new heart-face find. The Aviator row here is the 58 mm size; the oval page used the 55 mm size of the same model, with a lens height of 47.5 mm. The two sizes are different rows, and their heights differ by 2.6 mm, computed as 50.1 mm minus 47.5 mm. Do not mix the two sizes when you order.
4. Lens height and cheekbone coverage
Pick lens height by cheekbone coverage, not by shape name: the bottom of the lens must clear the top of your cheekbone when you smile, and the top of the lens must sit at your brow line.
A heart-shaped face is widest at the temples and narrowest at the chin, so the lens has two jobs that pull in opposite directions. It has to be tall enough to cover the cheekbone, and short enough not to carry weight down toward the chin taper. A lens that is too tall does the second job badly: it drops past the cheekbone and hangs over the taper, and the lower face reads narrower than it is. A lens that is too short does the first job badly: it stops above the cheekbone, the cheek stays bare, and the frame reads as a band across the forehead.
The models show the trade in numbers. The Wayfarer at 41 mm is the shallow end. The Clubmaster at 43.9 mm sits 2.9 mm taller, computed as 43.9 mm minus 41 mm. The Aviator at 50.1 mm sits 9.1 mm taller than the Wayfarer and 6.2 mm taller than the Clubmaster, computed as 50.1 mm minus 43.9 mm. That 9.1 mm span is the whole choice. If your brow-to-cheekbone distance from section 2 is short, the shallow end fits inside it. If that distance is long, the deep end fits inside it. If a lens is taller than that distance, it will touch your cheek when you smile, and no shape name will fix that touch.
"sunglasses work better when they balance the shape of the face instead of copying it too closely" (r/DumbFact, 2026-08-26). Copying would mean a front that is wide at the top and narrow at the bottom, repeating the face. Balancing means a lens whose bottom edge stops at the cheekbone instead of following the taper down. Styling does not change bone width. It only adds visual weight where the lens sits, and removes it where the lens stops. Pick the height that stops at the cheekbone.
5. Temple length and fit: why a pair becomes impossible to wear for long
Temple length decides whether a pair stays wearable for a whole day, not lens width: the four models run from 135 mm to 150 mm, a span of 15 mm, computed as 150 mm minus 135 mm, so two pairs with the same lens width can sit 15 mm apart at the ear (ray-ban.com and costadelmar.com, verified 2026-11-12).
The models make that span concrete. The Aviator prints a temple length of 135 mm. The Clubmaster prints 145 mm. The Wayfarer prints 150 mm. The gap between the shortest and the longest is 15 mm, computed as 150 mm minus 135 mm. A buyer who orders by lens width alone never sees that gap, because the lens widths in the table run only from 50 mm to 58 mm, while the temple lengths run a wider span. Two pairs with the same lens width can sit 15 mm apart at the ear.
The failure shows up after the mirror check, not during it. The front looks right. The bridge feels right. Then the arm presses behind one ear, or the arm ends before the ear and the front creeps down the nose. That is the wear behind the quote in section 1: "my current sunglasses are basically impossible to wear for long" (r/EyewearEnthusiasts, t3_1wt30by, 2026-09-29). The most likely reason is temple length, not the front width; that reading is this page's inference, not something the wearer named.
Check the arm in two places. First, where it meets the ear: the tip must reach behind the ear without pressing into it, and the arm must lie flat against the side of the head without bowing outward. An arm that bows outward is telling you the front is narrower than your temple width, even if the front looked right in the mirror. Second, where it leaves the hinge: the arm must leave the front in a straight line, with no outward step at the hinge. A step there adds width at the temples, which is the widest part of a heart-shaped face, and it does so at the exact line the front is supposed to end on.
6. UV and polarisation: read the label, not the tint
Check the label for 100% UV protection or for the words UV absorption up to 400nm: either wording passes, and polarisation is a separate feature that does not provide UV protection (aao.org, verified 2026-11-12; page published 2026-07-20).
The label check has three steps, and each one is a word on the tag, not a guess from the lens. First, look for a sticker or tag that promises 100% UV protection from all types of UV light. Second, accept the alternative wording when you see it: some labels say UV absorption up to 400nm, which is also acceptable. Third, do not count polarisation as protection: polarisation itself does not provide UV protection, so a polarised pair still needs one of the two UV wordings above.
That separation matters for a heart-shaped face buyer for a practical reason. The buyer in this guide has already spent the fitting effort on temple width, lens height, and temple length. A pair that passes all three fitting checks and fails the label check is still the wrong pair, because the fit checks do not test ultraviolet light. Read the label before you keep the pair, and keep the pair only when the label carries one of the two wordings in this section.
7. The three-step try-on check: decide before you remove the tags
Run three checks before you remove the tags: the front-to-temple line, the look-down and smile check, and the 60-second temple-arm check.
Step one is the front-to-temple line. Face the mirror straight on, with the pair sitting where it will sit when you wear it. Look at the outer edge of the front on each side. It must sit flush with your temple line, neither past it nor short of it. This is the pass line from section 3, applied to the pair in your hands. If the edge passes your temples, the front is too wide for your temple width. If the edge falls short, the front is too narrow.
Step two is the look-down and smile check. Tip your head forward as if you are reading, then smile. The bottom of the lens must not touch your cheek, and the frame must not slide down your nose. A lens that touches the cheek on a smile is taller than your brow-to-cheekbone distance from section 2. A frame that slides on a look-down has the wrong bridge number for you: go back to the bridge span in section 3, 14 mm to 22 mm across the four models, and move one step on it, not to a new shape name.
If the bridge number is right and the pair still slides, check whether the pair has adjustable pads before you change the bridge number again. A wearer report on the square-face page describes pads stopping a flat-bridge slide; the full sentence lives there: sunglasses for square face. No nose-pad specification was checked for the four models on ray-ban.com and costadelmar.com on 2026-11-12, so the pad check is a report to test, not a specification of any model in the table.
Step three is the 60-second temple-arm check. Wear the pair for 60 seconds and do not adjust it. This 60-second duration is this page's criteria (faceshapelens.com, 2026-11-12). If the arm presses behind either ear inside those 60 seconds, the temple length is wrong for you. If the arm bows outward at the hinge, the front is too narrow for your temple width. If nothing presses, nothing bows, and nothing slides, the pair passes.
"Do these fit my face shape?" (r/sunglasses, 2026-05-09). That question has no yes-or-no answer from a shape name. It has an answer from these three checks: the front ends at the temples, the lens clears the cheek on a smile, and the arm holds for 60 seconds without pressing. A pair that passes all three fits your measurements. A pair that fails any one of them does not, whatever shape is printed on its box.
8. One line to close
For the optical-frame version of the same temple-width problem, including the flush-endpiece rule, read the glasses page: glasses for heart face shape.
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