Eyelash Thickness, Length & Curl Explained

By Katarina V.| Last updated on December 17, 2021
Eyelash Thickness, Length & Curl Explained
⏱️ 4 min read

It comes as no surprise that eyelash extensions are so high in demand – they are currently the best way to enhance your look and make your eyes more appealing and open. Creating great eyelash extensions requires knowledge, a steady hand, skill, and a lot of practice.

The more advanced this treatment is becoming, the more new styles are developing, so you can choose between different styles. Also, lash extensions come as individual and in fans, and they can come in different eyelash thickness, curl, and length.

Let’s go through different types of lash extensions.

Which Styles Are There?

Eyelash extensions are artificial fibers that are dipped into a lash glue and attached to your natural lashes, one by one. Currently, the most popular styles are:

  • Classic lashes – one eyelash extension attached to one of your natural lashes.
  • Volume lashes – also known as Russian volume eyelash extension. Fans of 2-6 (or more, for mega volume) very thin lashes are attached per one natural lash.
  • Hybrid lashes – combines these two techniques, so both individual lashes and fans are attached to natural lashes, making them look voluminous, yet wispy and natural.
  • Wispy lashes – also combine classics and volume lashes, but of different lengths to create a natural-looking but thick lashes.

4 Eyelash Extensions StylesImage source: Instagram @ghazalzarrabi_eyelashes

Eyelash Thickness

Eyelash extensions can go from 0.03 mm to 0.25 mm in thickness. Thicker lashes are usually used for classic eyelash extensions, while the thinner ones are for volume fans.

When choosing which eyelash thickness to use on a client, the most important thing is to assess the thickness and the state of their natural lashes. If you choose extensions that are too heavy for them, they can damage their natural lashes. So compare the natural lashes to the extensions, and choose those that are slightly thicker than the natural ones.

The most popular eyelash thickness for classic lashes is between 0.10 and 0.15 mm. It is recommended to use the 0.03-0.10 lash extensions to create volume, mega volume and hybrid lashes, and technicians prefer 0.05 and 0.07 for these styles.

Eyelash Length

When it comes to length, eyelash extensions range from 5 mm to 15 mm. Again, just as when you choose the eyelash thickness, when choosing the length you need to assess the client’s natural lashes first. Choose the extensions that are 2-3 mm longer than the natural lashes.

Shorter extensions of 5-9 mm should be used for inner corners. If the lashes are too long, they will be too heavy for a client’s eye and can damage their natural lashes. You can find pre-made lash maps with marked length and you should follow them.

Eyelash extensions length range from 6 mm to 15 mm.Image source: Instagram @topstareyelashextensions.sally

Eyelash Curl

Eyelash extensions also come in different curls, as not all clients want or can have the same extension style. There are 3 types of natural lash angles: straight, downwards and upwards, and the technician should choose the curl based on that.

Here are all the curls and on which lash angle they should be used:

J curl eyelash extensions
J curl is the straightest lash style, and it shouldn’t be used on downwards lashes, but only on straight and upwards ones.

B curl eyelash extensions
B curl looks natural and gives the eyelash curler effect. It’s best to use them on straight and upward lashes. These are also great for inner corners.

C curl eyelash extensions
C curl is the most popular. It gives the effect of uplifted lashes and open eyes. It can be used on all angles and give great results.

CC curl eyelash extensions
CC curl is somewhere between C and D curl – curlier than C, but not as dramatic as D curl lash extensions. Clients love this one the most.

D curl eyelash extensions
D curl lashes are dramatic and glamorous. This curl is suitable for clients with downward-angle natural lashes.

DD curl or U curl eyelash extensions
Very glamorous and curly, perfect for those who have a downward angle of natural lashes.

L curl eyelash extensions
L curl is perfect for people with hooded eyes and those with straight or upward lashes. The result is a harsh upwards curl that gives the effect of a lash lift.

Eyelash Extensions Types and Curls

Which Eyelash Extensions Are the Most Popular?

The most popular eyelash extensions are CC, 0.07, 12 mm. It gives the most natural look and is suitable for most people. However, bear in mind that it is not for everyone. The reason why eyelash extensions come in different thicknesses, lengths, and curls is to make the best, customized look for every client.


When choosing the right eyelash thickness, length, and curl for your client, be very careful and don’t rush it, especially if you’re a beginner. If the extensions are too heavy, they can damage their natural lashes. So, take your time to assess the natural lashes of your client properly and listen to their expectations to choose the most adequate style.

Cover image source: Freepik



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