Cup Construction: Contour, Molded, Spacer, Seamed
Four words the product page throws at you, one actual question: how is the cup made, and what does that construction do on a body? This is the dictionary entry the whole style dictionary leans on.
The four constructions
Every cup is a bet about your shape. Seamed cups build shape from fabric panels and hold it with structure; molded cups are heat-formed into one fixed dome; contour cups are molded cups with a thin foam layer; spacer cups are contour’s modern successor, foam knitted with air channels. The differences decide smoothness, breathability, honesty about fit, and how much of your own shape survives.
Side by side
| Construction | Under a t-shirt | Breathability | Shape it gives you | Fit tolerance |
|---|---|---|---|---|
| Seamed / cut-and-sew | Seams can print under thin knits | Best: fabric only | Yours, lifted and directed by the seam plan | Most forgiving: panels flex to profile and asymmetry |
| Molded (unpadded) | Smooth | Good | A gently idealized round | Middling: the dome assumes a profile |
| Contour | Smoothest; adds a modesty layer | Warmest of the four | The cup’s round, uniformly | Strictest: foam holds its shape whether or not you fill it |
| Spacer | Smooth with a lighter hand | Near-fabric: air moves through the knit | Your shape lightly rounded | Between contour and molded |
Choosing by what you actually want
| If you want | Reach for | Because |
|---|---|---|
| Invisibility under knits | Contour or spacer | One uninterrupted surface: the whole t-shirt bra category is this construction. |
| Cool wear in heat | Spacer, then seamed | Air channels beat solid foam by a season’s worth of comfort. |
| Real lift at real depth | Seamed | Panels and slings carry load foam cannot; it is why full-bust engineering is seamed almost without exception. |
| Your own shape, honored | Seamed or unlined molded | Foam replaces your contour with its own; fabric follows yours. |
| Forgiveness across asymmetry or cycle changes | Seamed and stretch-top styles | Flexible construction absorbs difference; rigid foam reports it, as the asymmetry playbook details. |
The honesty section
Foam is a truth serum: a contour cup gapes or overflows at the first millimeter of mismatch, which makes it the strictest fitting-room test you can buy and the style most likely to expose a profile mismatch that a seamed cup would quietly absorb, the mechanics the gaping guide maps. That strictness is a feature when you use it: fit well in contour and you fit well in everything.
Two vocabulary traps while you shop. "Molded" on a product page sometimes means contour, since the foam version is molded too: check for the words "lined," "lightly lined" or "unlined" to know whether foam is present. And "padded" spans everything from a modesty layer to push-up cookies: thickness, not the word, is the spec.
The trade in one table
| You gain | You give up |
|---|---|
| Foam: one smooth surface and a modesty layer | Breathability, and honesty is mandatory: foam fits exactly or visibly not |
| Spacer: foam’s smoothness at half the heat | A touch of contour’s absolute smoothing |
| Seams: real lift at depth and forgiveness across profiles | Possible seam lines under the thinnest knits |
Reading a product page
The construction is always on the page, rarely in the title: "lightly lined" means contour, "unlined" means no foam, "spacer" names itself, and a visible seam map in the photos means cut-and-sew. Match the words to the tables above and most online sizing surprises evaporate before checkout; the t-shirt guide and unlined guide go deeper on the two poles.
Cup Construction: answered
What is the difference between contour and molded?
Molded means heat-formed into a fixed shape; contour means molded with a foam lining. Every contour cup is molded, but an unlined molded cup has no foam: it is the shape without the layer, cooler and slightly less smoothing.
Are spacer cups better than contour?
For heat and weight, clearly: air moves through the knit and the cup is lighter. Contour still smooths a touch more absolutely and shapes a touch more assertively. Spacer is the better default summer choice at the same fit.
Why do seamed bras fit me when molded ones never do?
Because seams flex to your profile and foam does not. If molded styles always gape at the top or cut at the sides while seamed styles fit, your profile differs from the dome the foam assumes: nothing is wrong with you, and the gaping guide’s profile matrix names your likely cut.
Cup Construction vs other styles
Keep reading
The smooth, seamless molded bra built to disappear under knits. Here is what a t-shirt bra actually is, which …
EverydayWireless BrasNo underwire doesn't mean no support, but the support comes from somewhere else. Here is where, who wireless …
EverydayBalconette BrasThe balconette is the fitter's favorite for a reason: an open top line that flatters more shapes than any othe…
EverydayBralettesSoft, wireless, usually alpha-sized: the bralette is comfortable by design and supportive by accident. Here i…
EverydayPlunge BrasA low center gore, angled cups and a neckline that disappears under a V: the plunge is engineered for cleavag…
EverydayPush-Up BrasPadding placed low and to the side lifts and pushes tissue up and in. Here is what a push-up bra actually chan…
Opens HauteFlair’s own hub page; use your measured size there. HauteFlair is owned by the same company as Brasize.ai; that relationship never changes the sizing math, charts, or fit advice on this page. How this site makes money.
Know the style. Now get the size.
Two measurements, one exact size, then the construction that fits your shape.
Calculate My Bra Size →