Underlash extensions are lashes applied underneath your natural lash line, instead of on top of it. The technique is called underlashing, and it gives you a wider, more open, doe-eyed look that sits more naturally than traditional top-lashing.
Because the lashes go under your own, they push your natural lashes up and forward. The result is fuller-looking eyes without that heavy "strip lash" band on top.
You can get underlashing done at a salon, or do it yourself at home with pre-bonded lash clusters. Here's how it works, who it suits, and how to try it.
Want to try underlashing at home? Pre-bonded NIMBLE clusters are ideal, they're applied cluster by cluster, so you control exactly where each one sits.
Underlashing vs Traditional Top-Lashing: What's the Difference?
With top-lashing (the classic method), lashes are applied on top of your natural lashes. It's the standard for strip lashes and most extensions.
With underlashing, the lashes go just beneath your natural lash line. This:
- Lifts and opens the eye for a wide, doe-eyed effect
- Looks more seamless and natural, with no visible band on top
- Suits hooded and monolid eyes especially well, because it adds height without weighing the lid down
It's the secret behind a lot of that soft, "your eyes but bigger" look you see all over TikTok and Xiaohongshu.
Think of it as a little beauty hack that takes your lash game to the next level. This method is used by both salons and DIY lash extensions to give the appearance of fuller lashes without the tell-tale strip line that often comes with traditional lash application.
Benefits of Underlashing
Why are so many beauty lovers raving about this new technique? Aside from its natural appearance, there are several other benefits that make underlashing a must-try:
- No Obvious Lash Band: The lash band is completely hidden when applied underneath your natural lashes, leaving no visible trace that you’re wearing falsies.
- More Natural Looking: No visible lash strip and better blending means your lashes look less “drama” and more natural.
- Less Stress & Gentler on Your Natural Lashes: One of the biggest complaints about traditional false lashes is how heavy they can feel on your eyelids. Attaching lashes under the lash line is gentler and much less damaging. This helps maintain the health of your natural lashes over time.
- Eye-Lifting Effect: This technique tends to offer a more subtle yet effective eye-lifting look, perfect for those who want a gentle enhancement without an overly dramatic result.
How to Do Underlash Extensions Yourself (DIY)
Underlashing may sound tricky, but it’s easier than you think! Here’s how you can perfect the technique at home:
- Prep Your Natural Lashes: Start with clean lashes. Remove any makeup or oils to ensure the lash adhesive can stick properly. You can also curl your natural lashes lightly if you want to achieve a more pronounced lash lift effect.
- Choose Your Falsies: Opt for lightweight, flexible lashes that won’t weigh down your natural lashes. For DIY users, it’s essential to pick lash strips or segments designed specifically for application below the lash line, like those found in our Lash Routine Starter Kit.
- Apply Lash Adhesive: Use a high-quality lash adhesive, and apply a thin layer to the lash band. Let the glue sit for about 20-30 seconds until it becomes tacky. This ensures the lashes stick firmly.
- Placement is Key: This is the magic moment! Gently place the lash strip or segments underneath your natural lash line. You’ll need to hold the lashes close to your eye, but be careful not to touch your waterline. Use tweezers or an applicator for precision.
- Press and Secure: Once placed, gently press the false lashes into your natural lashes to secure them. You can use the back of your tweezers or a lash applicator to ensure everything is in place. You can use a spoolie to brush through them for an extra seamless finish.
Underlash Clusters vs Salon Underlash Extensions
Salon underlash extensions look beautiful, but they come with the usual catch: time, cost, and lash-line stress from constant wear and refills.
DIY underlashing with press-on clusters gives you:
- Control over placement and how dramatic you go
- Cost savings versus salon sets and refills
- A break for your natural lashes, because they lift off gently at the end of the day
That's intentional beauty: the look you want, on your terms.
FAQ
What are underlash extensions? Underlash extensions are lashes applied beneath your natural lash line rather than on top. The technique, called underlashing, lifts and opens the eye for a wider, more natural, doe-eyed look with no heavy band sitting on top.
What is the difference between underlashing and top-lashing? Top-lashing applies lashes on top of your natural lashes; underlashing places them underneath. Underlashing looks more seamless, adds lift, and suits hooded and monolid eyes especially well.
Are underlash extensions better for hooded or monolid eyes? Often, yes. Because the lashes sit under the lash line, they add height and openness without weighing down the lid, which flatters hooded and monolid eye shapes.
Can you do underlash extensions at home? Yes. With pre-bonded lash clusters you can DIY underlashing: look down into a mirror and place each cluster just under your natural lash line from the outer corner inward. No glue or salon visit needed.
How long do underlash extensions last? DIY underlash clusters typically last a full day to a few days per application and are reusable. Salon underlash extensions last a few weeks but need refills and put more ongoing stress on your natural lashes.
What lashes are best for underlashing? Shorter, natural cluster styles work best because they sit neatly under the lash line. Pre-bonded NIMBLE clusters in softer styles like FAIRY or WISPY are ideal, and you can add lower lashes for an even more open look.
