Beauty Sephora Size Up Guide: How to Get Bigger Lashes That Last
An educational guide from the Beauty AMZ research team. No hard sell, just what you need to know.
What Makes Size Up Different
Most volumizing mascaras rely on a big, fluffy brush. Size Up uses an hourglass shape instead. The narrow center holds short, dense fibers that pack pigment onto lashes. The wider ends carry longer fibers that separate and lift. This two zone design builds volume and definition in one tool. The formula contains volumizing microbeads that add bulk without clumps. It is vegan and free of animal derived ingredients. Sephora markets it as delivering 180 percent more volume after twenty strokes, measured on false lashes in lab testing. Real world results vary by lash type. The design logic is sound for most users: load in the middle, separate at the edges.
How to Apply Mascara for Maximum Volume
Start with clean, dry lashes and no leftover liner. Look down into a mirror to expose the lash base. Place the wand at the roots and wiggle side to side. This deposits the most product where lashes are thickest. Pull straight through to the tips in one smooth motion. Apply a second coat before the first fully dries. Two thin coats beat one heavy coat every time. Coat the lower lashes lightly with the wand tip only. Finish by checking for clumps and separating with a clean spoolie if needed.
Why Sephora Keeps It Exclusive
Sephora Collection is the retailer's private label brand. Keeping hero products exclusive drives store traffic and loyalty. Size Up sits alongside other Collection bestsellers that rarely leave Sephora shelves. Third party sellers sometimes list Collection products on Amazon, like Big By Definition. Size Up has not made that jump in any reliable way. Exclusivity also protects pricing and freshness. Mascara has a short shelf life, so buying from the source guarantees a fresh tube. If you want the real Size Up, Sephora is the only safe bet.
Copying the Look With Amazon Finds
You can fake the Size Up effect with the right technique. Start with Big By Definition mascara from Amazon for volume. Wiggle at the roots, then pull through, exactly as described above. Add the Sephora Collection liquid eyeliner tight to the lash line. Tightlining makes lashes look denser without visible liner. Curl lashes before mascara for extra lift that lasts all day. Dust a little translucent powder on lashes before the second coat for added bulk. The result reads as XXL lashes in photos and in person.
Mascara Hygiene and Shelf Life
Mascara is the makeup product most likely to cause eye infections. Never share your tube with anyone. Never pump the wand in and out, since that pushes air and bacteria inside. Replace every mascara three months after opening, no exceptions. Stop using it immediately if it smells odd or changes texture. Remove mascara every night with a proper eye makeup remover. Sleeping in mascara dries lashes and causes breakage. Store the tube upright in a cool drawer, not in a steamy bathroom.
When to Just Buy From Sephora
Sometimes the dupe hunt costs more time than it saves. If you want the exact hourglass brush and the exact formula, buy Size Up at Sephora. The standard tube is affordable for a prestige mascara. Sephora often runs sales and gives samples with orders. The mini version is perfect for testing before committing. Amazon alternatives make sense when you already shop there or want the two pack value. They do not make sense when only the original will do. Be honest about which shopper you are.
Recommended Products
These are the real Sephora Collection eye products you can buy on Amazon right now.
Best for: Shoppers who want Sephora Collection lash volume from Amazon.
Sephora Collection Big By Definition Defining and Volumizing Mascara, 2 Pack
- Defining and volumizing mascara
- Long wearing formula
- Sephora Collection branding
Pros
- Closest Sephora Collection mascara on Amazon
- Two pack gives strong value per tube
- Long wearing defining formula
Cons
- Not the actual Size Up formula
- Two tubes may expire before use
Best for: Anyone pairing bold mascara with sharp liner definition.
Sephora Collection Long Lasting Eyeliner High Precision Brush, 01 Black
- High precision brush tip
- Intense black pigment
- Long lasting wear
Pros
- Ultra fine tip for precise lines
- Highly pigmented black formula
- Long wearing finish
Cons
- Liquid liner needs practice
- Not waterproof
Best for: Waterline definition and smudge proof everyday wear.
Sephora Collection Waterproof 12HR Retractable Eyeliner Pencil, 27 Matte Forest Green
- Waterproof 12HR formula
- Retractable pencil with sharpener
- Creamy blendable texture
Pros
- Waterproof 12 hour wear
- Creamy retractable pencil format
- Built in sharpener included
Cons
- Green shade is bold for daily wear
- Single shade option in this listing
Ready to Choose?
See our top product picks for sephora size up mascara, or jump straight to the head-to-head comparison of the two most popular options.