The sandwich method has been extremely popular for years, both in hair salons and among clients looking for a quick, aesthetic and comfortable way to lengthen or thicken their hair. No wonder — well-matched tape-in hair extensions help create a natural-looking result without visible joins, while the application itself is quick and convenient.

GrzechHair offers Tape On Duo NN+ natural human hair, designed for hair salons and demanding clients who expect good quality, a wide colour palette and comfortable application. These hair extensions are intended for the sandwich method, also known as the tape-in or tape-on method.

You can find Tape On Duo NN+ hair here: Tape On Duo NN+ hair

What are tape-in hair extensions?

Tape-in hair extensions are strands of natural human hair attached to special thin tapes. During application, the hairdresser places two tape-in sections around a natural strand of the client’s hair. This is why the technique is often called the sandwich method — the natural hair sits between two tapes with the hair extensions.

This solution is valued mainly for:

• quick application time,
• a flat, discreet finish close to the scalp,
• comfortable wear,
• the option to lengthen and thicken the hair,
• a natural-looking hairstyle,
• relatively easy maintenance and repositioning during follow-up salon visits.

Correctly applied tape-in hair extensions should not be visible during everyday wear. However, correct application, the right colour match and proper aftercare are essential.

Tape On Duo NN+ hair – what makes this line different?

The NN+ Tape On Duo line has been created for people who expect a natural-looking result and a wide choice of colour options. It is natural human hair available in a broad palette of shades — from deep black, through natural browns, beiges and blondes, to fashionable ombre, balayage and AirTouch-inspired shades.

Key features of Tape On Duo NN+ hair:

• natural human hair for the sandwich method,
• around 45 colours in the palette,
• solid colours, ombre, balayage and AirTouch variants,
• lengths of 30, 40, 50 and 60 cm,
• 3-month guarantee,
• option to extend the guarantee to 6 months after sending the hair back for regeneration after 3 months,
• improved tabs, i.e. Tape On Duo tapes,
• an offer suited to both hair salons and individual clients.

This is especially important for hairdressers who need a consistent, practical product that is comfortable to use in everyday work with clients.

Tape On Duo – how are the improved tapes different?

NN+ hair is available in the Tape On Duo version, which means it has improved tabs — the tapes used during application with the sandwich method. For a hair salon, this is very important because the quality of the tape affects working comfort, the appearance of the join and the comfort of wear.

Good tapes should be:

• thin,
• flexible,
• comfortable for the client,
• as discreet as possible close to the scalp,
• suitable for repositioning the hair,
• stable during correct use.

With the sandwich method, the quality of the hair itself matters, but so does the quality of the join. Even a beautiful colour and a good hair structure will not deliver the expected result if the tape is too stiff, visible or uncomfortable. That is why the Tape On Duo version is a practical choice for professional salon work.

Available lengths and weights of Tape On Duo NN+ hair

Tape On Duo NN+ natural human hair is available in several lengths and weight options. This allows the hairdresser to adjust the amount of hair to the desired result — subtle thickening, greater volume or a full-length extension.

Available options:

In practice, a smaller number of tape-in pairs works well for filling out a hairstyle, thickening the sides or gently adding volume. For full hair extensions, the hairdresser usually selects a larger number of packs, taking into account the density of the client’s natural hair, the desired length and the final result.

How do you choose the length of tape-in hair extensions?

The choice of length depends on the client’s current hairstyle and the result they want to achieve.

30 cm is a good choice for subtle thickening, a natural extension of shorter hair or balancing the proportions of the hairstyle.

40 cm works well for clients who want a noticeable but still very natural-looking extension.

50 cm is one of the most frequently chosen lengths for classic hair extensions.

60 cm gives the most striking effect and is suitable for those who want long, feminine hair.

In the salon, it is worth remembering that the length should be matched not only to the client’s expectations, but also to their natural hairstyle. With very short or heavily layered hair, a suitable blending cut may be needed to achieve a smooth, aesthetic result.

Tape On Duo NN+ colour palette – over 45 shades

One of the biggest advantages of Tape On Duo NN+ hair is its wide colour palette. The range includes both classic solid colours and fashionable ombre, balayage and tonal transition shades.

The palette includes, among others:

• black shades,
• natural browns,
• light browns,
• dark blondes,
• natural blondes,
• beige blondes,
• golden blondes,
• ash blondes,
• iridescent blondes,
• platinum shades,
• ombre,
• balayage,
• AirTouch-inspired colours.

This allows the hairdresser to match the shade not only to the client’s hair colour level, but also to highlights, colour temperature and the final result.

The most popular Tape On Duo NN+ hair colours

Among the most frequently chosen colours are natural brown shades, cool fashionable blondes and ombre colours. Below are examples of shades worth considering when working with clients.

Natural browns and darker colours

For clients with dark hair, classic natural shades that are easy to match with salon colouring are a good choice.

Popular options:

• colour 1.0 – black,
• colour 2.0 – dark natural brown,
• colour 3N – light natural brown.

These colours work very well with natural browns, dark bases and clients who want to thicken their hair without a visible colour change.

Light blondes, beiges and platinum shades

Blonde shades are among the most frequently chosen colours for hair extensions. The Tape On Duo NN+ palette includes warm golden shades as well as cool blondes and platinum shades.

It is worth noting:

• colour 7.2 – very light pure iridescent blonde,
• colour 7.7 – light iridescent golden blonde,
• colour 10.1 – pure ash,
• colour 10.2 – pure iridescent platinum,
• colour 10.22 – iridescent golden platinum,
• colour 11.01 – pure ash platinum.

Cool blondes and platinum shades are especially useful when working with clients who have lightened hair or toning towards beige, ash or cool platinum.

Ombre, balayage and AirTouch – a ready-made effect without additional colouring

Tape On Duo NN+ hair is not limited to solid colours. The palette also includes fashionable ombre and balayage shades, as well as variants inspired by the AirTouch technique. This is a major advantage for salons, as it helps achieve a multi-dimensional colour effect more quickly, without the need for additional lightening or toning of the hair extensions.

Popular ombre options and colours with tonal transitions:

• Alaska – ombre 6.0/8.2,
• Nordic Beige – ombre 6.2/10.2,
• Sun Bear – AirTouch from 3N to 7.2,
• Smokey Nut – ombre 5.0/7.2,
• Polar Bear – AirTouch from 7.2 to 10.2,
• Amber Wood – ombre 2.0/4.0,
• Brown Bear – AirTouch from 6.0 to 7.3.

Ombre and AirTouch shades are especially convenient when the client has hair with natural regrowth, highlights or multi-tonal colouring. Thanks to ready-made colour transitions, the hairdresser can more easily achieve a soft salon-style result.

Who are Tape On Duo NN+ natural human hair extensions suitable for?

Tape On Duo NN+ hair is ideal primarily for clients who want to:

• lengthen their hair,
• thicken their hair,
• add volume at the sides,
• even out the length of their hairstyle,
• achieve a blonde, ombre or balayage effect without additional colouring,
• quickly transform their hairstyle,
• achieve a natural-looking result without visible joins.

They are also a good option for hair salons looking for hair available in many colours and lengths. The wide palette makes it easier to match strands to different clients — from dark browns to very light platinum shades.

Can tape-in hair extensions be dyed?

Tape On Duo NN+ hair can be dyed, but please remember that colouring voids the guarantee. This is very important information for both salons and individual clients.

If the colour needs to be matched, it is best to choose a shade as close as possible to the client’s hair at the purchase stage. For more complex colour matches, consider ombre, balayage or AirTouch shades, which often blend better with the natural base and do not require additional chemical processing.

Dyeing, lightening or toning hair extensions should always be done consciously. Even with natural human hair, any colouring process can affect its condition, structure and durability.

3-month guarantee with the option to extend to 6 months

Tape On Duo NN+ hair comes with a 3-month guarantee. There is also an option to extend the guarantee to 6 months. To do this, after 3 months the hair must be sent back to GrzechHair for regeneration.

This is a practical solution for clients who want to enjoy the hair in good condition for longer, and for salons that want to offer clients additional support after several months of wear.

Please remember that dyeing the hair voids the guarantee. That is why it is best to choose the colour, length and quantity of strands carefully before purchase, according to the planned result.

How should you care for tape-in hair extensions?

Proper care is extremely important for the durability and appearance of hair extensions. This applies especially to natural human hair, which — just like the client’s own hair — requires appropriate treatment.

Basic care rules for tape-in hair extensions:

• gently brush the hair, starting from the ends,
• do not pull the tapes while brushing,
• use products recommended for hair extensions,
• do not apply oily products directly to the tapes,
• avoid sleeping with wet hair,
• tie the hair loosely for sleep,
• regularly check the condition of the joins in the salon,
• have the hair repositioned as recommended by your hairdresser.

Well-cared-for tape-in hair extensions retain an attractive appearance, softness and comfort of wear for longer.

The sandwich method in the salon – why choose professional application?

Although the sandwich method is quick and convenient, it requires knowledge and precision. Professional salon application helps avoid the most common mistakes, such as placing the tapes too close to the scalp, uneven strand placement, choosing the wrong amount of hair or applying the hair in the wrong direction.

When applying tape-in hair extensions, the hairdresser should assess:

• the condition of the natural hair,
• the density of the client’s hair,
• the starting length,
• the planned final result,
• colour and highlights,
• placement of the tape-in pairs,
• comfort of wear.

This means the result not only looks good immediately after application, but is also comfortable for everyday wear.

How much tape-in hair is needed for thickening or lengthening?

There is no single universal number of tape-in pairs for every client. The amount of hair depends on natural density, starting length and the desired result.

For subtle thickening, a smaller number of strands is often enough. For a full hair extension, especially with thick or shorter natural hair, a larger number of tape-in pairs will be needed. That is why the quantity is best discussed with a hairdresser.

The Tape On Duo NN+ range includes packs of 5 or 10 tape-in pairs in selected lengths, making it easier to tailor the order to a specific service.

Why choose Tape On Duo NN+ hair?

Tape On Duo NN+ natural human hair is a good choice for those looking for a combination of a wide colour palette, practical lengths and comfortable tapes for the sandwich method.

Key benefits:

• natural-looking result after application,
• wide choice of colours,
• fashionable ombre, balayage and AirTouch shades,
• several lengths to choose from,
• convenient weights,
• improved Tape On Duo tapes,
• suitable for salon work with many types of colouring,
• 3-month guarantee,
• option to extend the guarantee to 6 months after regeneration.

This product responds well to the needs of hair salons, but it can also be a good choice for individual clients who want to buy hair for professional application.

View the full range: Tape On Duo NN+ hair

FAQ – frequently asked questions about Tape On Duo NN+ hair

What are tape-in hair extensions?

Tape-in hair extensions are strands of hair placed on thin tapes, applied using the sandwich method. Two tape-in sections are attached around a natural strand of the client’s hair to create a flat and discreet join.

Are tape on and tape in the same?

Yes, the terms tape on and tape in are often used interchangeably. Both refer to hair on tapes used in the sandwich method.

Is Tape On Duo NN+ natural human hair?

Yes, Tape On Duo NN+ is natural human hair designed for lengthening and thickening using the sandwich method.

What lengths are available?

Tape On Duo NN+ hair is available in lengths of 30 cm, 40 cm, 50 cm and 60 cm.

How many grams are in a pack of Tape On Duo NN+ hair?

The weight depends on the length and number of tape-in pairs. For example, 30 cm / 5 tape-in pairs is 15 g, 40 cm / 10 tape-in pairs is 40 g, and 50 cm / 10 tape-in pairs is 50 g.

Can tape-in hair extensions be dyed?

Yes, the hair can be dyed, but colouring voids the guarantee. It is best to choose the right colour at the time of purchase.

How long is the guarantee on Tape On Duo NN+ hair?

The standard guarantee is 3 months. It can be extended to 6 months if, after 3 months, the hair is sent back to GrzechHair for regeneration.

Who is Tape On Duo NN+ hair for?

It is hair for hair salons and individual clients looking for natural human hair for the sandwich method in a wide colour palette.