Bamboo viscose (often also written as "bamboo viscose") is an artificial textile fiber derived from the cellulose of the bamboo plant through an industrial chemical process. It is therefore not a 100% natural fiber, but a soft, lightweight, and breathable cellulosic derivative, increasingly popular in everyday bamboo underwear as an alternative to cotton and microfiber.
What is bamboo viscose and how is it made?
Bamboo viscose belongs to the same family as wood viscose and rayon: they are all artificial fibers based on regenerated cellulose. In this process, bamboo is the raw plant material, not the finished product: the plant is harvested and turned into pulp, exactly as happens with wood intended for textile cellulose.
The pulp is then dissolved in chemical solvents to obtain a dense, viscous solution (hence the name of the fiber); this solution is spun through small holes and regenerated in an acid bath, which transforms it into thin, continuous filaments. These filaments are then cut, spun, and woven into the fabric used to make garments. It is an industrial process in every respect, involving multiple chemical steps, not a simple mechanical processing of the plant as in the case of cotton.
In the Risalti line, you can find it in both women's bamboo underwear, from tops to culottes, and in men's bamboo briefs and boxers. In both cases, the fabric is created from the same fiber transformation process; only the model and cut of the garment change.
Is bamboo viscose natural?
No, not entirely: the starting raw material is natural, but the finished fiber is classified as artificial because it requires a chemical process that dissolves and regenerates the cellulose into a new filament. For this reason, bamboo viscose does not retain all the properties of the original plant, contrary to what some commercial labels suggest. If you read "100% natural bamboo" on a garment, it is a red flag: no viscose, whether from bamboo or other origins, can be defined as a 100% natural fiber in the technical sense of the term, because the industrial chemical step is a necessary part of the process.
What are the characteristics of bamboo fabric?
The characteristics of bamboo fabric that truly matter for underwear are few but concrete: softness, moisture management, breathability, and performance after washing. The fabric obtained from bamboo viscose is soft to the touch, lightweight, and has a good ability to absorb moisture, typical of cellulosic fibers: for this reason, it is often chosen for garments in direct contact with the skin, such as underwear and tank tops. On its own, viscose has little elasticity; therefore, in underwear, it is almost always blended with a small percentage of elastane, which ensures a snug fit without losing the softness of the base fiber.
It is also a breathable fiber, which allows air to circulate better than many pure synthetic fibers, and has a slightly cooler hand-feel compared to cotton. The flip side: it does not have the mechanical resistance of synthetic fibers, it tends to wrinkle more easily, and it requires more delicate washing, as we will see later in this guide.
Bamboo, cotton, or microfiber: how do they compare?
| Criteria | Bamboo viscose | Cotton | Microfiber |
|---|---|---|---|
| Softness to the touch | Very high, velvety effect | Good, drier to the touch | High, but with a more technical feel |
| Moisture absorption | Good, typical of cellulosic fibers | High | Low: synthetic fibers absorb little and push moisture to the outside |
| Breathability | High | High | Medium, depends on the weave |
| Drying times | Slower, retains more water | Medium | Fast |
| Washing care | Delicate: low temperatures, no bleach | Resistant, tolerates more vigorous washing | Easy, washes and dries without much care |
None of the three is "the best" in absolute terms: bamboo viscose wins on softness and daily comfort, cotton remains the easiest choice to care for, and microfiber is the most practical for sportswear or seamless shaping garments that need to dry quickly.
How to recognize true bamboo viscose?
With a few precautions, you can distinguish a well-declared bamboo viscose garment from an unclear label:
- Read the composition label. It must explicitly state "bamboo viscose" or "viscose from bamboo," with the percentage of the total fabric (usually blended with polyamide and elastane for underwear).
- Check the certifications. Look for a verifiable certificate number, such as OEKO-TEX Standard 100, not a simple generic logo without references.
- Be wary of absolute promises. Claims such as "100% natural bamboo" or unverifiable miraculous properties are the first sign that the label is simplifying (or forcing) the reality of the production process.
Is bamboo underwear sustainable?
It depends primarily on the production process, not just the starting plant. Bamboo is among the fastest-growing plants in the world and regenerates without the need to be replanted after harvesting, with water requirements generally lower than conventional cotton and no need for pesticides to grow. However, this relates to the cultivation of the raw material: the transformation into viscose remains an industrial chemical process, and it is this step that determines the overall environmental impact of the finished fabric.
There are no standard percentages of "sustainability" to cite: it depends on the production facility and the solvents used, and varies from manufacturer to manufacturer. A verifiable piece of data, however, is the OEKO-TEX Standard 100 certification, which attests to the absence of harmful substances in the finished product, not the environmental impact of the production process: these are two different things, and it is good not to confuse them when reading "sustainable" on a label.
Who is bamboo underwear for?
It is a choice designed for those who seek daily comfort more than technical performance: the softness of the fiber and, in seamless models, the absence of seams, make it suitable for prolonged use throughout the day, under other garments, or as everyday underwear. Thanks to its breathability, it is particularly comfortable in hot months or for those who tend to sweat, while in colder months it works well as a light base layer.
It is not, however, the most suitable fiber for those looking for high-compression or technical sportswear: for that use, in the Risalti catalog, the seamless microfiber lines designed for activewear remain more suitable.
Why choose Risalti bamboo underwear?
Risalti bamboo garments are certified OEKO-TEX Standard 100 no. 20CX00003, issued by CENTROCOT, Class II for direct contact with the skin: verifiable data, not a generic label. Production is 100% Made in Italy, made in Castel Goffredo (MN) at our production partner, using seamless technology. In the product sheets, the typical composition of bamboo underwear is 80% bamboo viscose, 14% polyamide, 6% elastane.
Among the available models: the Bamboo Wide-Strap Top, designed to be worn alone or under other garments in hot months, and the Bamboo High-Waisted Brief, with a more covering fit on the waistline, for her. The Bamboo Culotte is the right choice for those looking for more coverage on the leg. For him, the Bamboo Men's Boxer applies the same fabric and the same seamless workmanship as the women's line.
What do the reviews say?
On the product pages, you will find real customer reviews, not text written for this article. As of September 19, 2026, for example, there are:
- Soft Touch Bamboo Classic Brief: average rating 5.0 out of 5, based on 4 reviews
- Women's Bamboo Wide-Strap Top: 5.0 out of 5, based on 4 reviews
- Women's Bamboo High-Waisted Brief: 4.67 out of 5, based on 6 reviews
- Women's Bamboo Culotte: 5.0 out of 5, based on 4 reviews
- Men's Soft Touch Bamboo Boxer: 5.0 out of 5, based on 3 reviews
These numbers will change over time: for updated details and the full text of the reviews, the reference remains the page for each product.
How to wash bamboo underwear?
It must be washed at low temperatures (generally up to 30°), avoiding bleach and, whenever possible, the tumble dryer: these are the same precautions that apply to the other delicate fibers in the Risalti catalog, such as merino wool. For the complete guide on temperatures, detergents, and drying, see the guide to washing seamless underwear and merino wool.
Frequently asked questions about bamboo viscose
Is bamboo viscose the same thing as cotton?
No: cotton is a natural fiber obtained directly from the plant, while bamboo viscose is an artificial fiber obtained by chemically transforming bamboo cellulose.
Does bamboo keep you warm or is it also suitable for summer?
Thanks to its breathability and ability to manage moisture, bamboo underwear is comfortable in hot months, but also remains a good base as a first layer in the mid-seasons.
Is there bamboo underwear for men as well?
Yes, Risalti offers a dedicated line of bamboo underwear for men, including briefs and boxers, with the same fabric and the same seamless construction as the women's line.
Is bamboo viscose hypoallergenic?
There are no hypoallergenic fibers in an absolute sense. Bamboo viscose is appreciated for its softness and, in seamless models, for the absence of seams; Risalti garments are also OEKO-TEX Standard 100 certified in Class II for direct contact with the skin.
Does it lose softness after many washes?
Like all cellulosic fibers, bamboo viscose stays in better condition with delicate washes at low temperatures; high temperatures, bleach, or tumble drying tend to reduce its softness over time.
