Sevich 100g Hair Building Fibers powder bottle overview showing product size and packaging design.
Sevich 100g Hair Building Fibers showing available color shade options for natural hair matching.
Sevich 100g Hair Building Fibers covering bald spot and thinning area on scalp for fuller-looking hair.
Sevich 100g Hair Building Fibers application method showing how to shake and pat fibers onto scalp.
Sevich 100g Hair Building Fibers before and after comparison showing added hair volume and coverage.
Sevich 100g Hair Building Fibers refill pack size comparison showing large quantity for extended use.
Sevich 100g Hair Building Fibers showing keratin fiber electrostatic binding to natural hair strands.
Sevich 100g Hair Building Fibers for men covering receding hairline and thinning crown areas.
Sevich 100g Hair Building Fibers for women concealing thinning hair and part line for fuller look.
Sevich 100g Hair Building Fibers natural-finish result showing no clumps or residue on styled hair.
Sevich 100g Hair Building Fibers washing out easily with shampoo showing clean-rinse formula.
Sevich 100g Hair Building Fibers resistant to wind and sweat maintaining hold throughout the day.
Sevich 100g Hair Building Fibers color blending technique mixing two shades for natural gradient effect.
Sevich 100g Hair Building Fibers close-up view of scalp coverage and fiber density on thinning area.
Sevich 100g Hair Building Fibers full coverage before and after result showing transformed hair density.
Sevich 100g Hair Building Fibers all available color options displayed showing full shade range.

Sevich 100g hair building fibers powders

Keratin Fiber Concealer Refill

(88)
$15.27

A cosmetic keratin fiber powder that instantly conceals thinning hair — not a hair growth or hair loss treatment.

  • Instant Density
  • 10 Shade Options
  • Lightweight Hold
  • Rinses Out Completely
Color: dk-brown

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About: Sevich 100g hair building fibers powders

100g Refill Pack

4–6 weeks of daily use

10 Shade Options

Blend for highlights or ombre

12–24 month shelf life

Store away from heat & light

Rinses Out Completely

Washes out easily with regular shampoo

Product Details

Sevich 100g Hair Building Fibers is a keratin-based hair fiber concealer built for one job: making thinning hair look fuller, instantly and temporarily. It is not a hair growth product or a hair loss treatment. Shake the fibers over a thinning area, pat them in, and within moments the electrostatic charge in the keratin pulls them onto your existing strands, filling in the look of sparse patches and receding areas.

This 100g pack is Sevich's larger refill format, made to last through weeks of regular use topping up a shaker bottle or precision applicator. It's available in ten shades, so you can match your natural root color closely, or combine two adjacent shades to blend with highlighted or ombre hair for a more natural gradient.

The fibers are formulated to sit lightly on the hair rather than clump or build up, so the finish reads as texture and density rather than product. They work across hair types and on color-treated hair, and hold up reasonably well through a normal day, though a light hairspray mist before and after application helps them stay in place through wind, humidity, or activity.

We think it's worth being direct about this: these fibers conceal the appearance of thinning hair by clinging to strands that are already there — they do not treat, prevent, or reverse hair loss, and they will not create coverage on skin with no hair to hold onto. Any improvement in appearance is temporary and washes out completely with shampoo. If you're experiencing ongoing hair loss or a receding hairline, a doctor or dermatologist is the right resource for treatment options.

To use, apply only to hair that is completely dry, shake the fibers evenly over the target area, and pat gently with your fingertips to settle them in. Style with a wide-tooth comb or your fingers, and wash out completely with regular shampoo whenever you're ready.

Pair with real hair-loss-focused care from our Hair Loss Products collection.

Why Choose This Refill

A Concealer, Not A Treatment. These fibers conceal the appearance of thinning hair by clinging to strands that are already there. They do not treat, prevent, or reverse hair loss, and coverage does not appear on skin with no hair to hold onto.

Refill Format. Made to top up an existing shaker bottle or precision applicator, reducing waste and cost per use.

Temporary By Design. Washes out completely with regular shampoo — no lasting change to hair or scalp.

Concealer Benefits

Instant Density. Keratin fibers interlock with existing hair using static electricity for a fuller-looking finish in under a minute.

10 Shade Options. Blend two adjacent shades to match highlighted or ombre hair.

Long-Lasting Refill. The 100g size is designed to last through weeks of regular use.

No Clumping. Sits lightly on the hair rather than building up or weighing it down.

How To Use

Step 1. Style and dry hair completely — fibers work on dry hair only.

Step 2. Mist a light hairspray over the area before applying for improved hold.

Step 3. Shake fibers evenly over the target area and pat gently to settle.

Step 4. Seal with another light hairspray mist; wash out completely with shampoo when ready.

Main Ingredients

Material. Natural keratin protein fibers.

Color Options. 10 shades, blendable for a custom match.

Specefications
Color
BlackBrownGoldGrayRose gold
Product form
Powder
Suitable for hair type
All hair types
Target gender
Unisex
Shelf Life & Storage

Shelf Life. Best used within 12–24 months of purchase.

Storage. Store in a cool, dry place with the lid tightly closed — humidity causes clumping.

Safety Instructions

Patch Test. Patch test if you have a sensitive scalp.

Application. Apply in a well-ventilated area and avoid inhaling the powder; do not apply to wet or damp hair.

Cleanup Tip. Wash pillowcases regularly, as fibers transfer easily but wash out in the laundry.

Caution & Disclaimer

Caution. For external use only. Keep out of reach of children and pets. Avoid contact with eyes, broken skin, and sensitive areas.

Disclaimer. Our products are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a healthcare professional before use, especially if pregnant, nursing, or under medical care. Individual results may vary.

Licensing & Trademarks. All brand names, logos, product pictures, and trademarks are the property of their respective owners and are used strictly for identification purposes.

Shipping & Return

We process and ship all orders within 1–2 business days.

Most customers receive their orders within 4–7 business days, depending on location and carrier performance.

Once your order ships, you'll receive a tracking number via email or SMS to follow your delivery in real time.

Delivery times may vary slightly during peak seasons or weather conditions, but we always aim to get your order to you as quickly as possible.

We accept returns and exchanges within 14 days of delivery.

FAQs

Q: How do I apply Sevich 100g Hair Building Fibers for the most natural result?
A: Start with clean, dry hair. Lightly shake fibers over thinning areas, then pat to settle. For extra hold, mist a light hairspray before and after application. Style gently with a wide-tooth comb or fingers — avoid vigorous brushing.

Q: How do I choose the right shade — and can I blend colors?
A: Match the fibers to your root color. If you are between shades, go with the slightly darker tone for more depth. You can mix two shades (such as dark brown and black) directly on the hair to create a custom blend for highlights or lowlights.

Q: Will the fibers stay put in wind, sweat, or light rain?
A: Yes — electrostatic binding helps fibers cling to hair. A light hairspray significantly enhances durability through sweat, humidity, and light rain. For heavy rain or swimming, reapply afterward.

Q: Are the fibers safe for daily use and sensitive scalps?
A: The keratin-based formula is non-irritating for most users and washes out with regular shampoo. If you are highly sensitive, do a patch test and avoid inhaling the powder during application.

Q: What is the difference between the 100g refill and a standard bottle with applicator?
A: The 100g pack is a long-lasting refill meant to top up your existing shaker or precision applicator. Using an applicator helps target hairlines, part lines, and smaller spots more precisely while reducing waste.

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