The Ultimate Guide to Eyelash Extension Sizes, Curls and Styles of 2021

The Ultimate Guide to Eyelash Extension Sizes, Curls and Styles of 2021

The Ultimate Guide to Eyelash Extension Sizes, Curls and Styles of 2021

The eyelash extensions are very popular with salons and independent providers. In the research indicates of Market Research Future, North America was projected to have the maximum market share of 36.78 percent. That’s not all. The product also comes in many thicknesses, lengths, fullness, curls, and styles. One salon owner, for example, supplies over 10 brands of the product- not to mention the different types of lash extensions.

There are many different styles of eyelash extensions to match different eye shapes, but not many people know the styles of lash extensions. Lash extension styles are famous for three things: length, thickness, and curl. There can be large variations of crossovers between styles. A good lash tech will be able to custom your lashes to suit your eye shape.

As you can see, there’s more to learn about the lash extensions than you may have thought. This guide delves into every single topic that is linked and attached to eyelash extensive size chart, curls, length, and also thickness, particularly those used in salons for the lash pros. Read it to understand these concepts.

What are eyelash extensions? Eyelash extensions sizes, curls, and styles

To many ladies, eyelash extensions can enhance the thickness, lengths, fullness, and curliness of natural eyelashes and are available in various colors, and materials to cater to different needs. This first section provides important details about what eyelash extensions are, their sizes, curls, and styles.

What are eyelash extensions?

Eyelash extensions are semi-permanent lashes that made from several materials including mink, silk, synthetic, human, or horsehair and applied one by one on top of your own natural lashes with eyelash glue, Because lash extensions are glued on individually, unlike strip lashes, they’re super customizable and actually look real.

Eyelash extension thickness guide:

What is eyelash extension thickness?

Eyelash extension thickness is also known as eyelash extension diameters, they have different diameters(range from 0.03mm to 0.30mm) to suit everyone’s natural lashes, glamorize your eyes, and without damaging your natural lashes.

So it is important to choose the right diameter of eyelash extensions and the condition of your client’s natural lashes. Keeping in mind although thickness eyelash extension can create a glamorous looking, it could cause poor retention and fall off.

Eyelash extension thickness types


How to choose the right thickness for your eyelash extensions?

Before choosing eyelash extensions, you probably have a general idea of the desired look you’re hoping to achieve, usually, you will consider the two big categories classic extensions or volume extensions, both have their own unique benefits.

Classic lashes apply one lash extension to one natural lash and can keep a natural look, if you want an impressive, volume looking, the volume extensions may be a better choice, for you can apply two or more lash extensions to each individual natural eyelash.

0.03mm, 0.05mm, 0.07mm lashes are extremely fine and lightweight, they are used mostly for lash artists to create multiple volume lashes onto one natural lash.

0.10mm thickness lashes can also be used for classic 1D and volume 2D depending on the natural lash thickness and length.

0.12, 0.15, 0.20, 0.25, 0.30mm lashes are used on Classic, however, 0.15mm is thicker than most natural lashes, can create a glamorous effect look, popular with many clients and technicians. while 0.20, 0.25 and 0.30mm thick lashes are perfect for beginner lash technicians, due to easier to pick up by eyelash tweezers.

Furthermore, the natural eyelashes of Asians are thinner than those of other ethnicities, and the eyelashes of over the age of 50 clients are thinner than younger clients.

However, regardless of the ethnicity or age of your clients, you should always take a good look at the client’s natural lashes and decide what thickness is suitable for them.

Eyelash extension lengths guide:

Eyelash extension length types

Short: 5-8mm

Medium: 9-13mm

Long: 14-18mm

How to choose the right length for your eyelash extensions?

Most clients want the longest lashes, but the long natural lash extensions do no mean perfect eyelashes, you must keep in mind that the individual client’s lash condition should determine the length of the extension.

For example, if your clients’ natural lashes are short, and you want longer lash extensions, the strands would be thin, they may not be able to support longer volume lashes or affect their growth. While other clients’ natural lashes are long, and they want to increase their short extension fullness.

Generally speaking, natural lashes length is from 5mm to 18mm, most popular lengths are 6-13mm, shorter extensions of 6-9mm are used for inner corners or under eyelash extensions, and 9-13mm extensions are used for the majority of the set for these lengths tend to be the most forgiving, and they provide an improved look without being too drastic, as for 14mm or longer lashes extensions are used for creating a hybrid volume effect.

So it’s not as easy as simply deciding whether you want short, long, or in-between lashes, you should know techniques that would give you the length you wish for as well as keeping them healthy.

Here’s a video on what’s the eyelash extension length, thickness:

Eyelash Extension Curls Guide:

What are the different eyelash extension curls?

There is no one lash curl that fits all, instead, it is all about customizing lash curls to suit their face and eyes to create the look they want to achieve.

There are a wide variety of lash curls and even hybrids of curls that are at your disposal. Generally speaking, the most common curl types are J, B, C, and D. these curl types get perkier from J to D and a higher letter means a more pronounced curl, and CC, DD, LC, LD curls for hybrid lashes.

How to choose the right eyelash extension curls?

eyelash extensions curls

J Curl It is the most natural curl meaning it’s not very curled. These lashes are especially suitable for clients who have inner corners lashes or stick straight lashes pointing straight or upward, and not recommend for those who have a downward angle natural lash, for it will make the eyes look smaller and heavy.

B Curl It is the closest to our natural curl with a little more lift than J Curl. It appears straight at the base and then curl at the top, perfect for clients with straight natural lashes and add a little subtle drama on clients. They’re not for those with downward slanting lashes.

C Curl It is one of the most popular and regular curls worldwide. These curl lashes are perfect for clients with a slight curl or slightly downward angled natural lash because they can create an eye-opening effect without appearing too drastic. However, not a good choice for clients with heavily downward-angled lashes, we recommend using D curl instead.

D Curl It is also a very popular lash curl, very similar to C curl lash extensions, but just curlier than C curl. It is especially suitable for clients with small eyes or downward-angled natural lashes who want an open-eye and dramatic effect look.

L Curl It looks like an “L” with a flat base then curl and point straight up. It is very suitable for clients with straight and downward-facing lashes as well as bottom lashes because it provides a lift to lash lines and widens the look of your eyes. However, it isn’t used on downward-angle lashes, for it will appear to be heavy and unflattering due to its long flat base.

CC Curl CC curl is also called C+ curl, for it is curlier than C curl and offers a slightly higher lift but less curly than D curl, can create a more open look without the drama of D curl. So it is perfect for clients who have downward lashes and want visually lift their eyes, pick up the lashes that are growing down and create a fresh and rested look.

DD curl It is also referred to as the ‘U’ curl. It is the curliest lash extension. It is appropriate for clients with downward-angled natural lashes who want to create a dramatic doll-like look and get a noticeable and curled effect.

LC Curl It has a flat base like the regular L curl, but instead of going straight up. It curves like a C curl and flicks up at the tips. The LC curl is perfect for clients with deep-set eyes, downturned eyes, and straight natural lashes which allows the eye to open visibly and create a slight curve effect with glamorous looking.

L+ Curl It also referred to as “L-plus” curl, is slightly curlier than L curl, it is very similar to both the C curl and the D curl, however, this lash extension curl comes with a flat base and extreme curl and curves into a D curl instead of a straighter line.

L+ curl is perfect for clients who have straight natural lashes rather than upward or downward slanting lashes and helps the extensions blend with the clients’ natural lashes to create an ultimate and impressive lifting look.

We recommend the lash tech beginners starting with a J/B curl, J/B curl offers clients natural look while B curl for a bit curlier than J curl. Choose C curl if clients want an open eye look and their eyelashes appearing more lifted, it is the most popular curl. While D curl is for clients who have dramatically curled natural lashes, make them a mascara effect.

As for L series curls(L, LC, LD), all of them have a straight base, great for clients who have naturally straight lashes that point down to create an open eye look.

Here’s a video of how to choose the right eyelash extension curls:

How to curl eyelash extensions

When you’re getting lash extensions, you expect them to be perfect, length, volume and curl. However, what would you do when the lash extensions become straight? Can you curl eyelash extensions?

All you need to learn is how to curl eyelashes. It can be done, you just have to do it in very simplistic ways to make your eyes curled.

Therefore what is the best way to do it? Let’s take a look at some of the methods.

Lash mascara on eyelash extensions

Lash mascara can hold its shape and a curled look into place. , once the mascara fully dries.  In that case, avoid waterproof formulas at all cost, If the mascara is too wet it will tend to make them drop again.

Lash curler on eyelash extensions

Heated lash curlers vs Mechanical lash curlers

You shouldn’t try to curl the extension with a mechanical lash curler, for the eyelash curler is made to curl your natural lashes not to contour the curl of your extensions.

Most synthetic eyelash extensions are made from PBT (a thermoplastic fiber) with a preset curl from the lash manufacturer. The permanent curls of synthetic lashes are made with specialized tools and suitable heat, therefore you can’t replicate the process at home with a lash curler, especially when the extensions have been applied to your natural lashes.

So you can rebook an appointment with your lash pro-tech if your extensions lost their curl, became straight.

If you must curl your extensions, what is the best way and the least damaging to curl lash extensions? Only use a heated eyelash curler, or ask your lash tech. We will show you how to safely use a heated eyelash curler in this article.

What are heated curlers & Why use them?

Heated lash curlers are different from mechanical lash curlers, are perfect for curling natural lashes when wearing lash extensions. for they are designed with electric brushes, which can heat up softly on your lashes from underneath as you would with a mascara wand with no pressing, pressure, or pulling your lashes like that of a mechanical curler, they are excellent for fragile fibers like lash extensions.

How to use a heated curler on curling eyelash extensions

Step 1:

Always prep top-quality heated lash curler, if you plan on curling your lashes. your curler should be able to work well with your eye shape and have an ergonomic handle, that easy to hold.

Step 2:

You have to hold the eyelash curler correctly, carefully adjust your lash curler. Place it as close to your eyelash roots as you possibly can, avoid the curler touching the skin. Tightly squeeze and close the curler onto lashes.

Step 3:

Recommend you clamping down and holding tight the curl for about five seconds, and pump up along the lashes to reach the tips for a final curl.

Step 4:

Just slowly and steady tilt your lash curler a little bit and squeeze the curler gently. Then, you will get natural-looking curls.

Step 5:

Applying mascara after curling can help hold the whole look of yours, and a top-notch mascara will maximize your curl easily and conveniently for a long time.

How to choose the right eyelash extensions style for your client’s eye shapes:

Whether you are a lash expert or a beginner, the first step is to figure out the eye shapes of your client, so that you can choose the right eyelash extensions style that suits them.

First, let’s look at the most common eye shapes. Then decide lash extension styles accordingly and match the two together. Let’s get started…

Almond Eyes

Almond eyes feature almond-shaped eyes that have a slight point on the ends and are wide in the center of the eyes. If you have almond eyes, you are lucky, because you can use any length, thickness, and most eyelash extension styles as long as their lashes can handle it. Celebrity women with almond-shaped eyes include “Beyonce, Rihanna, Megan Fox.”

Monolid Eyes

These eyes shape is also referred to as single lidded eyes, which have finer lashes, so do volume lash extensions can give a unique look. To do the inner and outer corners L or L+ curls can create the appearance of a more open and larger eye shape.

Wide-set eyes

Wide-set eyes are the gap between eyes are more than one eye width, it is not an eye shape. Any curl will work with wide-set eyes, but avoid using the cat eye, as it might make your eyes look wider. Try to use shorter lashes on the outer corner will give the impression your eyes are closer.

Close-set eyes

It is not an eye shape but a space that a gap between the eyes of less than one eye. While working with clients who have close-set eyes, you should focus on accentuating the outer corners to lift and lengthen their natural shape.

If you keep longer lashes on the outer corner then you will give the impression of having wider eyes. Go for D curl for the lid and CC curl covers the outer corners.

Downturned eyes

Downturned eyes need lots of corners lift, for the outer corner of the eye sits below the inner corner of the eye. It is the opposite of close-set eyes, so the goal is to create volume and curl on the outer corner of the eyes to help lift the eye. Try to use curls type C, CC, and DD. Avoid using straight curls type B on the outer corner.

Hooded eyes

Hooded eyes have a larger inner corner but a smaller outer corner. Avoid using exaggerate length and thickness, try to use curls type L, C, CC, or D to highlight the middle part of the eyes, it will give your clients the impression of bigger eyes.

Deep-set eyes

Deep-set eyes are also an eye position rather than a shape. The main characteristic of that it sits deeper into the eye socket. So the aim is to help it seems to come out a little more.

Try to select longer and straighter lashes that don’t curl immediately as they can touch the eyelids of your clients. You can go for a J curl that can open up the eyes or an alternative L and L+ curls that will also give you open and more alert eyes.

Prominent eyes

Prominent eyes are the opposite of deep-set eyes that sit further out of the eye socket. You can opt-in for B or J curl lash extensions to subdue protruding eyes as well as, go for cat eyes to make your outer corner more vivid and avoid opening protruding eyes further.

But D curl is the only best option for clients who have prominent eyes, you can add shorter D curl lashes for drama with a little more volume and boldness without overdoing it.


But there are no two sets of eyes that are the same, so before choosing the right eyelash extension styles to suit your client’s unique personality, you should understand everything about three important parameters length, thickness, and curl and take into account clients shapes of eyes, natural lashes. Remember analyzing your clients’ eye shapes will help you better find the perfect curls and styles for their lashes.

SinoLashes offers a wide range of different styles and materials eyelash extensions for lash pros to help their clients create a unique look!

If you have any further questions regarding our lashes, please contact us!


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