Sevich 100g Hair Fibers Refill is a cosmetic hair fiber concealer, not a hair growth or hair loss treatment — and it does exactly what it promises: in under a minute, it visually thickens thinning areas so your hair looks fuller right now. The natural keratin fibers cling to your existing strands using static electricity, blending in to cover sparse spots, visible parts, and exposed scalp.
This 100g size is a refill pack made to top up a compatible hair fiber applicator, and it comes in ten shades, so most people can find a close match to their natural color or blend two shades together for an even closer result. The fibers are lightweight and are designed not to clump or weigh hair down, which keeps the finish looking like real hair rather than a product sitting on top of it.
Because the fibers work by clinging to hair that is already there, they are most effective on thinning areas, part lines, and the crown, where there is still some hair for them to bond to — coverage on completely bald patches will be limited. Applied sparingly and blended well, the result is a natural-looking finish that lasts through a normal day.
It's important to be clear about what this product is: a temporary, cosmetic concealer that changes how thinning hair looks, not a treatment that grows new hair, stops shedding, or reverses hair loss. It washes out completely with regular shampoo, so there is no lasting change to the hair or scalp — just an easy way to feel more confident about your hair's appearance on any given day. Anyone dealing with ongoing hair loss should speak with a doctor or dermatologist about treatment options.
To use, apply the fibers to clean, completely dry hair, shaking them lightly over thinning areas and patting gently to blend. Finish with a light fiber-hold spray for extra staying power, and remove with your usual shampoo.
If you are also looking for scalp-focused options, take a look at our Hair Loss Products collection.