Which lash curl should you use?

Most curl confusion comes from treating the letters as a difficulty scale. They are not. J is not “easy” and D is not “advanced” — they are different amounts of arc, and each one solves a different problem with the eye in front of you.

What a curl actually measures

A curl describes two things at once: how far the hair lifts away from the natural lash line, and where along its length that lift happens.

A C curl starts lifting around the middle of the hair, so the base sits close to the natural lash and the tip points up. A CC curl starts lifting closer to the base, which pushes the whole hair outward and creates a rounder silhouette. An L curl does something completely different: it rises almost vertically for most of its length, then turns sharply outward at the top.

That last point matters more than most charts admit. Two curls can have similar arc but lift from different points, and they will look nothing alike on the same eye.

The seven curls, briefly

• J — minimal lift, tip only. Length without a visible set.
• B — soft lift. The everyday curl, and the safest first set.
• C — moderate lift from mid-length. The industry default for a reason.
• CC — strong lift nearer the base. Roughly 15–20° more arc than C.
• D — the strongest lift we make. Counters downward naturals and downturned eyes.
• L — vertical, then flat. Built specifically for hooded eyes and monolids.
• M — a two-stage arc with an angled kick at the tip. Editorial and photography.

Matching curl to eye shape

Almond eyes

Almost any curl works, which is why almond eyes are a poor test case for a new curl. C is the safe answer, CC if you want the eye to read rounder in photos. Avoid stacking maximum length at the outer corner — almond eyes already have natural lift there.

Round eyes

Go softer, not stronger. B or C lengthens the eye horizontally. A D curl on a round eye curls the tip back toward the lid and makes the eye read rounder, which is usually the opposite of what the client asked for.

Hooded eyes and monolids

This is where L earns its place. On a hooded eye, a C or D curl turns outward early and the tip disappears under the brow bone — the client pays for length nobody can see. L travels straight up first, so the length clears the hood before it turns. Pair L with a slightly shorter inner corner and the eye opens without looking surprised.

Deep-set eyes

The socket shadows the lash line, so the lift needs to be visible from straight on. CC is the sweet spot: enough arc to pull the tip out of the shadow, not so much that it looks theatrical in daylight.

Downturned eyes

D or CC, concentrated toward the outer third. The goal is to lift the outer corner visually, so keep the inner corner shorter and let the longest lengths sit at the outer edge. Using a strong curl evenly across the whole eye will drag the inner corner down instead.

Protruding eyes

Softer curl, shorter lengths. Strong curl plus long length exaggerates the protrusion. B or C with a flat, even map reads more balanced.

How curl and length interact

Length amplifies whatever the curl is doing. A 14 mm D curl will read dramatically more than an 11 mm D curl, because the arc has more distance to travel. When you change curl, change length in the same direction:

• Moving from C to CC? Drop 1–2 mm.
• Moving from C to B? You can add 1 mm safely.
• First time with L on a hooded eye? Start one size shorter than you would in C.

Three mistakes worth naming

1. Choosing by photo instead of by eye. A curl photographed on an almond eye tells you almost nothing about how it will sit on a hooded one.
2. Using D as a default for “more dramatic”. Drama usually comes from the map and the diameter, not from over-curling. A 0.07 C with a strong outer-corner map beats a 0.05 D every time.
3. Ignoring the natural lash direction. If the natural points down, no amount of curl fixes it — you need a lift that starts at the base, which is CC or D territory, not C.

How to test a new curl on a real client

Apply three lashes at the outer third, in the curl you are considering, and have the client look straight ahead at a mirror from a metre away. Then have them look down. If the tip vanishes when they look down, the curl is turning too early for that eye — step toward L. If the tip curls back toward the lid when they look straight ahead, the curl is too strong — step down one letter.

Where to go next

If you already know the curl, the full tray range lists diameters and lengths per curl. If you are buying for a salon, the wholesale page covers minimums, private label and lead times.