Lashify Isn't Magic. It's Engineering: How Underlash Extensions Work
Underlash extensions, explained: the lash, the bond, the wand and the techniques that make them work.
Updated October 2026 · 6 min read
We didn't invent underlash lashes to make another lash. We invented them because strip lashes lift, salon extensions are a standing appointment, and most false lashes feel like false lashes. Lashify's patented system is designed to wear lighter, look virtually undetectable and move with your natural lashes, so they look like your lashes, not lash extensions. Here is how it works.
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Take the lash quiz →What are underlash extensions?
Underlash extensions are lash segments placed under your natural lashes instead of glued on top of the lash line. Your own lashes rest on them and hide the base. Lashify invented the method, patented it as Underlash Technology®, and built a full system around it: the lash, the bond, the tool and the techniques.
1. The lash: Gossamer®
Gossamer® lashes are made from ultra-light Korean PBT silk and fused with heat into a thin Spine™ base that sits under your lashes. No thick band. Just soft, seamless volume. Gossamers are the lightest lashes in the world: they are made without glue, so nothing in the lash weighs it down.
2. The bond: flexible, not stiff
Lashify bonds use Micro-Flex™ technology to create a soft, flexible cushion around the natural lash, never stiff or brittle. Instead of a glue that sets hard, they use polymer attraction for a secure hold that moves naturally with your lashes. A sealer locks it in. How bond and seal work →
3. The tool: Fuse™ Control Wand
Internationally patented and ergonomically engineered, the Fuse™ Control Wand fuses lashes horizontally. Its horizontal Clamp Force™ presses the Gossamer® and your natural lashes together evenly along the whole spine, for a clean fuse every time.
4. The techniques
As the inventors of DIY lash extensions and Underlash Technology®, we also created the techniques that get the most from them:
- Fusing™: clamping the Gossamer® and natural lashes together on the spine. How to apply →
- The Frosting Method™: layering bond for longer wear. Watch the video →
- Stacking™: adding a second layer for volume. How to stack →
- Lash Mapping™: placing lengths to flatter your eye shape. Lash Mapping 101 →
It isn't magic. It's engineering. Obviously.
The result
Weightless lashes so comfortable you'll forget they're on, applied at home in minutes, worn for days (up to 2 weeks with the bond layered the Lashify way), and removed intact so you can wear them again. Protected by more than 700 patents and registrations worldwide. See the patents → · Read the full blueprint →
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Questions people ask
What are underlash extensions?
Underlash extensions are lash segments placed under your natural lashes instead of on top of the lash line. Lashify invented the method and patented it as Underlash Technology.
How do underlash extensions work?
You bond your natural lashes, place each Gossamer underneath them, fuse the two together on the spine with the Fuse Control Wand, then seal. Your own lashes hold the Gossamer and hide its base.
What are Gossamer lashes made of?
Ultra-light Korean PBT silk, heat-fused into a thin Spine base instead of being glued together.
Are underlash extensions better than strip lashes?
They wear differently: strip lashes sit on a band on top of the lid for a day, while Gossamer underlash extensions have no band, look like your own lashes and are worn for days.
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The whole system, in one kit.
