Length gets most of the attention. Curl decides how the set actually looks.
You can apply the same length lashes to two clients with the same eye shape and get completely different results depending on which curl you use. A 12mm D-curl reads dramatic and doe-eyed. The same 12mm in a J-curl reads barely-there natural. Same length, different curl, different set — same client, entirely different eye.
Yet curl is where most consultations skip past the detail. Clients name a length ("I want 13mm") and a style ("wispy" or "Kim K"), but rarely mention curl. Lash artists then choose based on eye shape, natural lash direction and the finish they want to create.
This guide is the complete reference. Every curl — J, B, C, CC, D, L, M — explained in plain terms, with eye-shape recommendations, style pairings, and how to choose. Whether you're a client wanting to walk into your next consultation with the right vocabulary, or a lash artist ordering the trays that suit your studio's demographic, this is your one-stop resource.
What is lash curl and how is it measured?
Lash extension curl refers to how much the extension bends upward from its base to its tip. Curl is measured on a lettered scale, not a numeric one — each letter represents a fixed curl profile that manufacturers produce to standard specifications.
The curl scale most Australian lash suppliers use runs, from flattest to most curled: J → B → C → CC → D → L → M. Each step curls slightly more aggressively than the last. Some suppliers also stock LC and DD curls as in-between options.
Curl is entirely separate from length and diameter. A single lash tray typically holds one curl, one diameter, and a range of lengths. Most lash artists stock multiple curl trays in their most-used diameters (usually 0.05, 0.07, 0.10 and 0.15 mm) to mix and match during application.
The 7 Lash Curls — Every Curl Explained
Here's the plain-language rundown of each curl on the standard scale:
J Curl — The Flattest, Most Natural Curl
J curl barely lifts from the base. It sits almost horizontally, mimicking natural Asian lashes and clients with very straight natural lash growth. J curl is rarely requested on its own in Australia — it's mostly used to blend with slightly curlier extensions on clients whose lashes grow straight down.
Best for: very straight natural lashes, downward-growing lashes, clients wanting the most subtle possible enhancement.
B Curl — Subtle, Natural, Slightly Lifted
B curl adds a gentle upward lift while still reading as natural. It's the curl clients ask for when they say "I want extensions but I don't want them to look like extensions." B curl is common on mature clients and those returning to work in professional settings where subtlety matters.
Best for: naturally straight lashes needing gentle lift, mature clients, everyday-wear enhancement.
C Curl — The Most Versatile Curl in Australia
C curl is the workhorse of the industry. It provides a clean, defined lift without being dramatic. It suits the widest range of eye shapes and natural lash directions of any curl. If a lash artist can only stock one curl, C curl is the answer.
Best for: most eye shapes, most natural lash types, first-time extension clients, classic sets.
CC Curl — Slightly More Lift Than C, Less Than D
CC curl sits between C and D on the scale. It gives a more visible curl than C without the full drama of D — a sweet spot for clients who want their extensions noticed without going full glam. CC curl has become one of the most requested curls in Australia over the last three years, particularly for hybrid and volume sets.
Best for: almond, round, and slightly downturned eyes; clients wanting soft drama; wispy sets.
D Curl — The Dramatic Doe-Eye Curl
D curl delivers the full doe-eye, wide-open effect. It's the standard curl for Kim K sets and glam volume looks. D curl requires strong natural lashes to sit properly — on very fine natural lashes, the aggressive curl can cause the extension to twist rather than sit flush.
Best for: almond and round eyes with medium-to-strong natural lashes; Kim K mapping; dramatic volume sets.
L Curl — The Lift-Focused Curl for Hooded Eyes
L curl is unlike the others — instead of a smooth arc, it has a distinct straight base that lifts sharply upward at the mid-point. This "L" shape catches the eyelid and pushes the extension out from under a hood, making it the go-to curl for hooded, deep-set, or heavily downturned eyes.
Best for: hooded eyes, deep-set eyes, downturned eyes, monolids; clients whose C or D curls disappear under the lid.
M Curl — The Most Extreme Lift
M curl takes L curl further, with an even sharper angle. It creates a very pronounced lift that reads almost like a strip lash. M curl is used sparingly — usually mixed with L or D curls on very hooded eyes, or for dramatic photoshoot and bridal sets where maximum lift is the goal.
Best for: severely hooded eyes needing rescue lift; bridal and photoshoot glam; specialty accent lashes.
The Full Curl Comparison at a Glance
| Curl | Lift level | Reads as | Best natural lash type | Best eye shape |
|---|---|---|---|---|
| J | Minimal | Barely there | Very straight, downward | Any (subtle) |
| B | Gentle | Natural | Straight | Any (mature clients) |
| C | Moderate | Clean, defined | Most types | Most shapes — the safe pick |
| CC | Moderate-strong | Soft drama | Most types | Almond, round, slightly downturned |
| D | Strong | Doe-eyed, glam | Medium-to-strong | Almond, round |
| L | Sharp lift | Rescue lift | Any | Hooded, deep-set, downturned |
| M | Extreme lift | Strip-lash drama | Strong | Severely hooded, bridal glam |
How to Choose Curl by Eye Shape
Eye shape is the single most important factor in curl choice. Here's the framework:
- Almond eyes: C, CC, or D curl. The most flexible eye shape — almost any curl looks good.
- Round eyes: CC or D curl. Enhances the natural roundness and creates the wide-open look.
- Hooded eyes: L curl (primary) or M curl (dramatic). Never D curl on the whole set — it disappears under the hood.
- Downturned eyes: L curl at the outer corners with CC or D across the centre — this pulls the eye visually upward.
- Upturned eyes: C or CC curl. Avoid heavy D or L — the natural lift is already there.
- Monolid eyes: L curl. It creates lift where the natural fold doesn't.
- Close-set eyes: C or CC through the centre with slightly stronger curl at outer corners.
- Wide-set eyes: D curl centrally to draw the eyes visually inward.
For a full eye-shape breakdown with mapping diagrams, see our Lash Mapping by Eye Shape guide.
How to Choose Curl by Natural Lash Direction
The direction the natural lashes grow determines how the extension curl sits — and gets ignored surprisingly often in consultations. Rule of thumb: choose a curl that matches or gently lifts the natural growth direction, never fights it.
- Naturally straight lashes: C or CC curl. D curl on straight lashes often twists.
- Naturally downward-growing lashes: L curl. Standard curls will point at the cheekbone rather than up.
- Naturally curled lashes: D curl. Anything less will look flat next to the natural bend.
- Mixed direction (very common): mix L curl on downward sections + C or CC on the rest.
Best Curl for Popular Lash Styles
Curl and style go hand in hand. Here's how to pair them:
| Style | Recommended curl(s) | Why |
|---|---|---|
| Classic natural | C | Clean lift without drama |
| Classic soft | B or C | Everyday enhancement |
| Hybrid | CC or D | The mix of density needs visible curl |
| Volume glam | D | Full doe-eye effect |
| Kim K / doll eye | D (centre) + CC (corners) | Centre-heavy lift |
| Wispy | CC or D | Holds spike definition |
| Cat eye / fox eye | CC + L at outer | Elongates outward |
| Hooded / modified | L primary | Escapes the lid |
| Bridal glam | D or M | Photograph-heavy sets |
For lash artists — the curl trays every studio should stock:
A well-stocked studio holds at minimum: C, CC, D and L curls in 0.05, 0.07, 0.10 and 0.15 diameter. Add B and M for specialty clients. Posh Deluxe stocks the full curl and diameter range across classic lashes, promade fans, and Camellia lashes at poshdeluxe.com.au/collections/lashes.
Curl-Specific Aftercare
The more curled the extension, the more careful the aftercare — sharper curls are more affected by pressure, sleep position, and heat.
- D, L and M curls should never be pressed against a pillow — always sleep on your side or back.
- All curls benefit from daily spoolie brushing, but sharp curls (L, M) especially — they crossover faster.
- Avoid mechanical eyelash curlers on ANY curl of extensions. Even natural-curl extensions can be damaged.
- Steam and heat can slightly relax any curl over time — hot showers and saunas are the biggest culprits.
- Use a foaming lash shampoo — see our How to Choose the Right Lash Shampoo guide for the picks we recommend.
Which Curl Lasts the Longest?
Retention is more affected by adhesive, isolation and natural lash cycle than by curl choice. That said:
- C, CC and D curls have the best retention on most natural lash types — they sit flush with the natural lash.
- L and M curls can have slightly reduced retention on clients whose natural lashes don't match the sharp angle — the bond point is smaller.
- J and B curls typically retain well because they place minimal stress on the natural lash bond.
If retention is an issue on any curl, work through our 15 Common Lash Retention Killers first — curl is rarely the actual cause.
Frequently Asked Questions
What is the most popular lash extension curl in Australia?
C and CC curl are the most requested overall. D curl leads for Kim K and volume glam sets. L curl leads specifically for hooded-eye clients.
Can I mix different curls in one set?
Yes — this is standard practice. Most experienced lash artists mix curls within a single set to accommodate different natural lash directions across the lash line. A common combination is CC in the centre with L at the outer corners for a soft cat-eye lift.
What's the difference between D and DD curl?
DD curl (sometimes called D+) sits between D and L on the scale. It has more lift than D but retains the smooth arc rather than L's sharper angle. Not every supplier stocks DD — it's a specialty curl.
Is L curl only for hooded eyes?
No — L curl works well anywhere maximum lift is the goal. Some artists mix L into the mapping of bridal or photoshoot sets even for non-hooded eyes, to boost drama.
Does curl affect how long lash extensions last?
Marginally. Retention is driven far more by adhesive quality, isolation, and the client's natural lash cycle than by curl choice. Choose curl based on the effect you want, not on retention concerns.
Can I change curl at every appointment?
Yes. Curl is one of the easiest things to adjust between sets. If you're not sure a curl suits you, ask your artist to do a half-set trial or use a different curl at each infill until you find the right fit.
What curl should I ask for if I want the Kim K look?
D curl (or a D-centre with CC blend at the corners). Read our full Kim K lashes guide for the complete mapping.
The Bottom Line
Curl choice is the single most under-discussed decision in a lash consultation — and one of the most important. The same length, diameter, and volume can look completely different depending on which curl your artist uses. C and CC are the safe workhorses; D delivers doe-eye drama; L rescues hooded eyes; B and J play the natural role; M is the specialty player.
Walk into your next consultation knowing your eye shape, your natural lash direction, and the effect you want. Your lash artist will handle the rest. For lash artists building your kit, C, CC, D and L across your core diameters covers 95% of Australian clients — the rest is speciality stock.
Shop the complete curl range at Posh Deluxe:
Classic and promade lashes in every curl (J, B, C, CC, D, L, M) across 0.03–0.20 diameters, in single trays and mixed-length trays. Australian lash artists trust Posh Deluxe for consistent curl quality tray after tray. Shop at poshdeluxe.com.au, or book your set with Paola at poshdeluxesalon.com.au in Mount Pleasant, Perth.
