TR90 vs Acetate vs Metal Sunglasses: Which Frame Material Is Right for Your Brand?

A brand owner from Portland called me last month. She'd been going back and forth between TR90 and acetate for six weeks. Her designer wanted acetate. Her accountant wanted TR90. Her Instagram followers kept commenting "love the metal vibes" on her mood boards. She was stuck.

I told her what I tell everyone: there's no universally "best" frame material. There's only the best materialfor your brand, your customers, and your budget. And after two decades of bending, breaking, and building frames from every material on the market, I can tell you exactly how to make that call.

Why Frame Material Matters More Than You Think

Here's something that surprised me early in my career: customers can't usually name the material of their sunglasses. They don't walk into a store and say "I'd like a pair of thermoplastic polyamide frames, please."

But they feel the difference instantly. They pick up a pair and within three seconds they've made a judgment: "these feel cheap" or "these feel expensive." That gut reaction? It's almost entirely about the material. The weight in their hand. The flex when they open the temples. The sound the hinge makes. The texture against their skin.

Frame material determines your manufacturing cost, your retail price ceiling, your target customer, your brand perception, and -- honestly -- whether your product ends up on someone's face or in a drawer after one wear. So yeah, it matters.

TR90: The Athlete

TR90 is a thermoplastic polyamide -- basically a super-engineered nylon. It was originally developed for medical equipment and military applications where you need something that won't break, won't irritate skin, and weighs almost nothing. The eyewear industry borrowed it, and now it's everywhere.

What TR90 Does Well

Weight: A full TR90 frame weighs 15-20 grams. For reference, that's about the weight of four coins in your pocket. I have clients whose customers wear TR90 frames for 14-hour days and forget they're on. No red marks on the nose, no sore spots behind the ears. For sport and active use, nothing beats it.

Durability: I keep a TR90 frame on my desk that I use for demos. I bend it, twist it, sit on it, throw it across the room. Been doing that for three years with the same pair. Still works perfectly. TR90 has what engineers call "memory" -- you can deform it and it springs back to its original shape. Try that with acetate and you'll hear a crack. Try it with metal and it stays bent.

Chemical resistance: Sweat, sunscreen, saltwater, bug spray -- none of it affects TR90. This matters more than people realize. I've seen acetate frames discolored by sunscreen after one summer. TR90 shrugs it off.

Cost: TR90 injection molding is fast and efficient. The raw material is inexpensive, the molds last for hundreds of thousands of cycles, and production speed is about 3x faster than acetate. That translates directly to your bottom line.

Where TR90 Falls Short

Look and feel: I'm going to be straight with you -- TR90 looks like plastic. Because it is plastic. High-end, engineered plastic, but plastic nonetheless. You won't get the depth of color or the rich tortoiseshell patterns you get with acetate. Matte finishes look fine; glossy TR90 can look a bit toy-like if not done carefully.

Color range: Solid colors work great. Gradient effects, multi-color patterns, translucent looks -- those are limited compared to acetate. We can do about 40 standard colors in TR90 versus 200+ in acetate.

Perception: Fair or not, TR90 doesn't scream "luxury." Customers picking up a $150 frame expect heft and warmth. TR90 feels light and smooth -- great for sport, but some fashion buyers equate light with cheap.

Acetate: The Fashion Icon

Acetate is the material that built the luxury eyewear industry. When you think of Ray-Ban Wayfarers, Tom Ford frames, or Celine oversized sunglasses -- that's acetate. It's made from cotton fibers and wood pulp processed into cellulose acetate sheets, which are then cut, shaped, and polished by hand. The best stuff comes from Mazzucchelli in Italy, who've been making it since 1849.

What Acetate Does Well

Aesthetics: Nothing else comes close. Acetate has depth. Hold a good tortoiseshell acetate frame up to the light and you'll see layers of amber, brown, and gold swirling through the material -- each pair slightly different. That's not a printed pattern; it's literally built into the material at the sheet level. You can't fake that with plastic.

Color range: 200+ colors and patterns, from classic black to wild multi-layer designs with contrasting inner and outer colors. Translucent, opaque, gradient, marbled -- acetate can do it all. This is why fashion brands love it. Every season you can introduce new colorways without changing the frame shape.

Premium perception: Acetate has weight -- 25-35 grams for a typical frame. It warms to skin temperature. It makes a satisfying "click" when the hinges close. These are tiny details, but they add up to a feeling of quality that justifies premium pricing. A customer holding an acetate frame instinctively expects to pay more -- and they're willing to.

Adjustability: Heat an acetate frame gently and you can reshape it to fit any face. Opticians love this. TR90 and metal can be adjusted too, but acetate gives the most precise, permanent fit.

Where Acetate Falls Short

Durability under stress: Acetate doesn't flex like TR90. Sit on an acetate frame and there's a real chance it cracks. Drop it on concrete and the temple tips can chip. It's not fragile -- it's tougher than glass -- but it doesn't have that rubber-like resilience.

Chemical sensitivity: Sunscreen, alcohol-based cleaners, and some perfumes can damage acetate over time. I always tell clients to include a care card with acetate frames -- "clean with water and a soft cloth, avoid chemical sprays." It's not high-maintenance, but it's not bulletproof either.

Production time: Acetate frames take 3-5x longer to produce than TR90. Each frame is cut from sheet stock, then goes through tumbling, hand-polishing, and multiple finishing steps. A TR90 frame is injection-molded in seconds. An acetate frame takes days of processing. That labor shows up in your unit cost.

Weight: 25-35 grams versus 15-20 for TR90. Some people find acetate frames heavy after extended wear, especially larger styles. For all-day sport use, it's not ideal.

Metal: The Classic

Metal frames have been around since the 1700s. Benjamin Franklin wore metal spectacles. The aviator -- arguably the most iconic sunglasses shape ever -- is a metal frame. When you think "classic," you think metal.

Today's metal sunglasses use stainless steel, titanium, aluminum, nickel alloys, or Monel (a nickel-copper blend). Each alloy has different properties, and the choice dramatically affects both the feel and the cost.

What Metal Does Well

Thin, elegant profiles: Metal lets you create frames that are impossibly thin. A wire-frame metal design can be 1-2mm thick -- try that with acetate or TR90 and it'd snap. If your brand aesthetic is minimalist, sleek, or architectural, metal is your material.

Timeless appeal: Metal aviators have been in style for 90 years and counting. The same basic metal frame shapes sell decade after decade. If you're building a "buy it for life" brand, metal communicates permanence in a way plastic never will.

Adjustability: A good optician can fine-tune a metal frame with hand tools in minutes. Bend the nose pads, adjust the temple curve, tighten the hinges. Metal is the most adjustable frame material, which means better fit across different face shapes.

Weight range: This one surprises people. Titanium frames can be as light as 12-15 grams -- lighter than TR90. Stainless steel is heavier at 25-35 grams. So "metal is heavy" isn't always true; it depends on the alloy.

Premium perception: Metal frames feel expensive. The cool touch of brushed stainless steel, the flex of titanium, the gleam of polished gold-tone -- these are sensory cues that justify premium pricing. Some of our best-selling OEM styles are metal frames retailing at $129-179.

Where Metal Falls Short

Cost: Metal is the most expensive frame material across the board. Raw material costs are higher, manufacturing involves more steps (die-casting, soldering, plating, polishing), and skilled labor requirements push the price up further. A basic stainless steel frame costs us $8-12 to produce; titanium runs $15-22.

Corrosion: Cheaper metal alloys can corrode, especially around the nose pads and hinge areas where sweat collects. We plate everything to prevent this, but plating wears over time. Titanium is the exception -- it's naturally corrosion-resistant, which is why it costs more.

Permanent deformation: Bend a metal frame past its elastic limit and it stays bent. Unlike TR90 which springs back, metal holds whatever shape you give it -- intentional or not. I've seen metal frames ruined by being shoved into a back pocket.

Skin allergies: Nickel allergy affects about 10-15% of the population. If your metal frames contain nickel (and most cheap ones do), a portion of your customers will get red, itchy marks on their nose and ears. We use nickel-free alloys and hypoallergenic plating to avoid this, but it adds cost.

Limited color options: Metal frames are typically gold, silver, gunmetal, black, or rose gold. You can do colored enamel accents, but you won't get the wild patterns and colors available in acetate.

Side-by-Side Comparison Table

Here's the cheat sheet I wish I'd had when I started this business. Pin this to your wall.

Real Cost Breakdown From the Factory Floor

Let me give you the numbers nobody else publishes. These are actual production costs from our factory -- not estimates, not averages, but what you'll pay when you place an order.

TR90 Frame Cost Breakdown

• Raw TR90 pellets: $0.80-1.20 per frame worth of material
• Injection molding: $0.50-1.00 (cycle time is 30-60 seconds)
• Hinges: $0.30-0.80 (spring hinges add $0.40)
• Surface treatment: $0.20-0.50 (matte coating, soft-touch, etc.)
• Assembly and QC: $0.40-0.80
• Logo application: $0.10-0.30 (laser engraving or pad printing)
• Total frame cost: $3-8 depending on complexity

Check out our TR90 collection to see the range of styles possible at these price points.

Acetate Frame Cost Breakdown

• Acetate sheet: $1.50-3.00 per frame (Italian Mazzucchelli adds $1-2 premium over Chinese acetate)
• CNC cutting: $0.60-1.00
• Tumbling and polishing: $0.80-1.50 (this is where the magic happens -- 24-48 hours of tumbling gives acetate its signature shine)
• Hinges: $0.40-1.00 (five-barrel hinges for premium, three-barrel for standard)
• Hand finishing: $0.50-1.50 (skilled workers inspect and touch up each frame)
• Assembly and QC: $0.50-1.00
• Logo application: $0.15-0.40 (metal logo plaques add more)
• Total frame cost: $5-11 depending on acetate source and complexity

Browse our acetate frames and you'll see the quality difference that extra cost buys.

Metal Frame Cost Breakdown

• Metal wire/sheet: $1.50-5.00 (stainless steel on the low end, titanium on the high end)
• Stamping/die-casting: $1.00-3.00
• Soldering: $0.80-1.50 (joining bridges, temples, end pieces)
• Plating: $1.00-3.00 (IP plating for durability, PVD for luxury finish)
• Nose pads and screws: $0.30-0.80
• Polishing: $0.60-1.50
• Assembly and QC: $0.80-1.50
• Logo: $0.20-0.50
• Total frame cost: $8-22 depending on alloy and finish

Our aviator collection shows what you can achieve with metal frames at different price tiers.

Retail Pricing Strategy by Material

Material choice directly determines your retail price ceiling and margin structure. Here's what I've seen work for our most successful brand clients:

TR90 Retail Strategy

Landed cost: $6-14 per pair. Retail sweet spot: $29-59. That gives you a 4-5x markup, which is healthy for DTC brands. At $69+ retail, customers start comparing your TR90 frames to acetate options at the same price -- and the acetate feels more premium. Keep TR90 in the value-to-midrange zone.

Exception: sport-specific TR90 frames (cycling, running, fishing) can retail at $79-99 because customers are paying for function, not fashion cachet.

Acetate Retail Strategy

Landed cost: $9-18 per pair. Retail sweet spot: $79-149. This is where most independent fashion eyewear brands live -- and it's a proven range. Italian acetate with polarized lenses? You can push to $149-199 retail if your branding supports it. Think wayfarer-style frames in unique colorways with premium packaging.

Metal Retail Strategy

Landed cost: $14-32 per pair. Retail sweet spot: $89-179. Metal gives you the widest pricing range because the alloy choice creates massive cost differences. A basic stainless steel frame at $89 retail and a titanium frame at $249 can both be profitable.

Which Material for Which Brand?

Let me paint some real scenarios based on brands we've worked with:

Scenario 1: Sport/Outdoor Brand

Go TR90. No question. A cycling brand from Colorado came to us needing frames that survive crashes, don't slip with sweat, and weigh next to nothing. We made them a wraparound TR90 frame with rubber nose pads and temple tips. Cost: $5.50 per frame. They retail at $49. Their Amazon reviews are full of people saying "I sat on them and they bounced back." That's TR90 doing its job.

Scenario 2: Fashion/Lifestyle Brand

Go acetate. A DTC brand from Brooklyn wanted chunky, bold frames in seasonal colorways. We sourced custom acetate sheets -- one season was emerald green with gold flecks, another was dusty rose. The frames look like they cost $300. They retail at $129. The material does half the marketing for you.

Scenario 3: Minimalist/Professional Brand

Go metal. A Scandinavian brand wanted ultra-thin, architectural frames in brushed silver and matte black. We made them in stainless steel with Japanese beta-titanium temples. Clean, precise, elegant. They retail at $159 and the target customer -- urban professionals -- loves the "less is more" aesthetic.

Scenario 4: Kids/Family Brand

Go TR90. Kids destroy everything. A family brand needed frames that survive being bent, chewed, thrown, and stepped on by toddlers. TR90 with integrated hinges (no screws to swallow). $3.50 per frame. They sell sets of three for $39. The margins are excellent and the return rate is near zero.

The Smart Play: Mix Your Materials

The best brands don't choose one material -- they use all three strategically. Here's a collection structure I recommend to new brand owners:

• 2-3 TR90 styles ($29-49 retail): Your entry-level. Gets customers in the door. Sport and casual styles that sell on function and value.
• 3-4 acetate styles ($79-129 retail): Your core line. Fashion-forward designs with seasonal colorways. This is where most of your revenue comes from.
• 1-2 metal styles ($99-179 retail): Your premium tier. Classic shapes that give your brand a "we do serious eyewear" halo effect.

This structure covers three price points, three customer types, and three use cases -- all under one brand. You're not leaving money on the table, and you're not forcing your brand into a single box.

Production Realities Nobody Talks About

MOQ Differences

TR90: 200-500 pieces per style (injection molds are expensive to make but cheap to run). Acetate: 100-300 per style (no molds needed -- cut from sheet). Metal: 300-1,000 per style (die-casting molds are complex). If you're starting small, acetate actually has the lowest barrier to entry per style.

Lead Time Differences

TR90: 25-35 days. Once the mold is made, frames come out fast. Acetate: 35-50 days. The polishing and finishing stages can't be rushed without sacrificing quality. Metal: 30-45 days. Plating is the bottleneck -- you're essentially waiting for chemistry.

Quality Control Differences

TR90 QC is mostly automated -- consistent injection molding means consistent output. Acetate QC requires experienced eyes -- every frame needs individual inspection because the pattern placement varies. Metal QC focuses on plating adhesion and solder joints -- the failure modes are different. We use different inspection teams for each material because the expertise doesn't transfer.

One Thing I Wish More Buyers Knew

The frame material is only half the equation. A $3 TR90 frame with $5 polarized CR-39 lenses, premium spring hinges, and beautiful packaging can feel more premium than a $10 acetate frame with basic UV400 lenses and cheap hinges. Don't blow your entire budget on the frame and cheap out on everything else.

Questions I Get Asked Every Week