Length mapping is what turns a set of extensions into a flattering eye shape. Here's how to use trays ranging from 10mm to 24mm to design natural, cat-eye, and doll-eye looks.
The basics of mapping
Mapping means assigning specific lengths to specific sections of the eye. Shorter lengths go on the inner corners; longer lengths build drama where you want it. Mixed-length trays (like 10–20mm ranges) make this faster because you have several lengths in one place.
Natural set
Follow the natural lash line: short inner corners (10–11mm), gradually longer toward the middle and outer (12–14mm). A 10–16mm tray is ideal.
Cat-eye set
Keep inner and middle shorter, then push length on the outer third for a lifted, elongated look. Reach for trays that go up to 20–24mm (like a 16–24mm range).
Doll-eye set
Put the longest lengths in the center of the eye to open it up and make it look rounder. A 10–20mm tray covers this perfectly.
Pro tip
Buy mixed-range trays so you're not juggling five separate boxes per set. It speeds up application and cuts waste.