The right lash is not chosen based on the visual effect alone. Curl, thickness, and length must collectively suit the client's natural lashes, eye shape, chosen technique, and the design to be created.
Quick answer
Choose technique and safe weight first, curl according to direction and desired lift, and length last based on the natural lash and your lash map.
Estimated reading time: 10 minutes · Updated July 25, 2026
Three decisions that guide the entire lash design
01 · CURL
Direction and lift
The curl affects how the lash leaves the lash line and how open, soft, or dramatic the result is perceived.
02 · THICKNESS
Weight and technique
The diameter affects the weight per fiber and whether the product is primarily suitable for classic, volume, or other professional techniques.
03 · LENGTH
Shape and load
The length shapes the silhouette but must also be justifiable for the natural lash meant to carry the extension.
How common curls differ
A curl designation describes the shape of the lash, but the same designation can feel slightly different across product lines. Therefore, always assess the physical strip and the client's natural lash direction.
| Curl | Visual expression | Keep in mind |
|---|---|---|
| C | Soft to distinct opening. | Versatile when natural direction and desired lift align well. |
| CC | More lift than C. | Check the contact surface and available lengths. |
| D | Distinct and dramatic. | A large difference from the natural lash can make placement difficult. |
| DD | Very pronounced lift. | Use when stable placement is possible. |
| M or L-type | Straighter base and distinct direction. | Assess base, direction, and contact surface with extra care. |
Thickness does not determine the result alone
Thickness is specified in millimeters and affects the weight per fiber. The thinner the fiber, the more fibers can typically be included in a professional volume technique – but there is no universal combination that suits all natural lashes.
0.15 mm
Common in classic single-lash technique.
0.07 mm
Thinner volume fiber for light fans.
0.03–0.05 mm
Very thin fibers for advanced volume techniques.
Soft Flat
Fiber profile with a different base than traditional round single lashes.
Bellestore Expert Tips
Design with three layers of decisions
Start with what the natural lash can safely support. Then choose the technique and diameter. Only when the foundation is set do you choose the curl and distribute the lengths in a lash map.
Choose length step by step
- Analyze the natural lash.
- Determine the desired expression.
- Place the highest point of the design.
- Build soft transitions.
- Customize per zone.
- Document the result.
Checklist before you open the box
Recommended products
Compare current lash series
See current price and availability on each product page.
Professional assessment takes precedence over a general table
This guide does not replace training, product instructions, or an individual assessment of the client's natural lashes.
Frequently asked questions
Which curl fits best?
Choose based on the natural lash direction, desired lift, eye shape, and the ability to create a stable contact surface.
What is the difference between 0.15 and 0.07?
0.15 is typically used as a single fiber, while 0.07 is a thinner fiber for volume fans.
What is a mix tray?
A mix tray contains several lengths in the same package.