Collar height and construction are the whole difference. A turtleneck has a tall tube of knit that folds back down over itself. A mock neck is shorter, stands up around the neck, and never folds. A roll neck, in the way the word is used for tees and fine knits today, is a softer collar that rolls rather than folds into a crisp band.
The names overlap. Britain calls the folded collar a polo neck, the United States a turtleneck, and some countries a roll-neck, so describe the collar, not the label.
The turtleneck, folded twice
A true turtleneck is knitted as a long tube, then folded down so the collar is two layers deep. That double layer is what makes it warm, and it's also what makes the knit weight matter so much. A fine turtleneck folds into a neat, flat band. A heavy one folds into a thick roll that sits high on the neck.
Our Baby Cashmere Knitted Long Sleeve Turtleneck is $780, made in Italy from 100% baby cashmere at 14 to 14.5 microns, knitted on a 7 gauge in 4 ply. The fold lies smooth rather than bulky, which is what you want under a coat.
Knitted as a tube and folded back, so the collar sits two layers deep.
The mock neck, which never folds
A mock neck borrows the look of a turtleneck without the fold. Its collar is a short tube with both edges sewn into the neckline, so it stands up on its own and stays at one height. It's cooler than a turtleneck, easier to wear through a heated day, and it keeps its line without adjusting.
We don't make a mock neck right now, and we'd rather say so than point you at something close. If a mock neck is what you want, look for one with a double-layer collar. A single layer tends to collapse after a few washes.
The roll neck, which rolls instead of folding
On knitwear and jersey, roll neck is often used for a collar that turns over in a soft curve rather than a sharp fold. It sits lower and looser than a folded turtleneck and doesn't need arranging in the mirror.
Our roll neck tees are built this way. The Light Weight Bamboo Sorona Long Sleeve Roll Neck T-Shirt is $145, 60% bamboo and 40% Sorona, knitted in Italy at 170 gsm and garment dyed by hand, with a raw edge hem and sleeves. There's a short sleeve version at $128.
Nothing here folds. The edge rolls and sits flat at the collarbone.
Are mock turtlenecks out of style?
No. Mock turtlenecks have stayed in steady rotation because they sit neatly under a jacket and don't need the fold managed. They read as modern rather than retro when the knit is fine and the fit is close. Where they look dated is in a thick, shiny synthetic with a collar that sags.
The same goes for turtlenecks in 2026. A well-made turtleneck isn't a trend piece. It's been a cold-weather staple for decades, and what dates one is poor fabric, not the collar itself.
Who each collar suits, by what you wear it with
Collar choice follows the rest of the outfit more than anything else.
A folded turtleneck suits someone who wears it as the main layer, under an overcoat or on its own, and wants the warmth of the double collar. It's the wrong choice under a shirt-collar jacket with narrow lapels, where the fold crowds the neckline.
A mock neck suits someone who wears a tailored jacket most days and wants a clean line with less bulk. It looks good on anyone who prefers a neat, fixed collar height.
A roll neck suits the person who wants the look without the ceremony. It works under a cardigan, a chore jacket or on its own, and it's the easiest of the three to wear indoors.
Who should skip a turtleneck? Anyone who finds a close collar uncomfortable through a long day, and anyone planning to wear it under a stiff shirt collar. For them, a mock neck or a roll neck tee does the job with less fabric at the neck.
Knit weight decides more than collar height
A fine roll neck tee under a jacket and a heavy turtleneck on its own are different garments, even though both cover the neck. Weight changes the drape, the warmth and how the collar sits.
We've written about how far weight can go in a fourteen-ply rollneck, where more plies trap more air without adding bulk. For the full picture of gauge and knit structure, our guide to fabrics, weights and knits covers the rest.
When the weather turns, the heavier options sit in our turtlenecks in the knitwear collection and the cashmere collection. For layering, start with a roll neck tee and add weight on top.
FAQ
Who should not wear a turtleneck?
Anyone who finds a close collar uncomfortable for a full day, or who plans to wear it under a stiff shirt collar or a jacket with narrow lapels. A mock neck or a lighter roll neck gives a similar line with less fabric at the neck.
Are mock turtlenecks out of style?
No. A fine-knit mock neck with a close fit sits neatly under a jacket and reads as modern. What looks dated is a thick, shiny synthetic with a collar that sags.
Who looks good in a mock neck?
Anyone who wants a clean, fixed collar height, especially under a tailored jacket. Because the collar doesn't fold, it adds less bulk than a turtleneck.
Are turtlenecks out of style in 2026?
No. A well-made turtleneck has been a cold-weather staple for decades. Fine yarn and a neat fold keep it current, while poor fabric is what dates one.