Hypoallergenic sunglasses and titanium frames

Glasses touch skin in exactly three places: the bridge of the nose, and behind each ear. Those are small areas under constant pressure and constant sweat, which is why a nickel reaction from spectacle frames shows up as two red patches behind the ears and one on the nose rather than as a general rash.

A rimless design removes the metal from around the lenses entirely, leaving only the bridge and the temples. Less metal is less exposure, and on a frame worn all day that is not a trivial reduction.

The catch is that the two remaining contact points — nose pads and temple tips — are usually silicone or acetate rather than the frame metal, and the title does not say. If your reaction is on the nose specifically, the pads are the first thing to change, and they are replaceable on most rimless frames.

Weight matters more than people expect for frames. A heavy pair concentrates pressure on the bridge of the nose, and sustained pressure produces marks and soreness that look like a reaction but are not one. If your complaint is indentations rather than itching, weight is the variable to change first.

Titanium's density advantage — roughly 45 percent lighter than steel for the same shape — is the whole reason ultralight frames are made from it.

As with all the frames here, the nose pads are unspecified and are the most likely point of contact irritation. They are also usually the cheapest part to replace.

The screws are the detail nobody mentions. A conventional rimless frame mounts each lens with a tiny screw, and those screws are frequently stainless steel because titanium is difficult to machine at that size. On a frame otherwise sold as titanium, they are the one component that is not.

A screwless design removes them. Whether that matters to you depends on whether the screws are anywhere near your skin — usually they are not, sitting at the lens mount rather than at a contact point — but it does mean fewer things to loosen and lose.

'100% Real Titanium' is doing marketing work, and it is the kind of phrasing that exists because the shelf around it is full of titanium-colored frames that are not.

A folding frame introduces extra hinges, and hinges are where a frame fails and where a coating wears. Against that, a pair you can put in a pocket is a pair you have with you.

Naming the lens material is more useful than it looks. Polycarbonate is impact-resistant and light, and it scratches more readily than glass — so this is a durable-but-marks pair rather than an optical-glass one.

A square frame puts more of the front against nothing at all; the contact points remain the bridge and the temples regardless of shape.

TAC is triacetate cellulose, a laminated lens construction where the polarizing film is sandwiched between layers. It is the standard mid-range polarized lens and it is a real specification rather than a marketing word, which is why it is worth noting.

The frame story is identical to the other Eyekepper pair: rimless titanium, minimal metal, unspecified pads.

Polarization is worth having for driving and for anything near water, and has nothing to do with skin. It is here because it is what the listing actually commits to.