100 bamboo bra, what the label says
Oct 11, 2026
Short answer: A 100 bamboo bra can mean two things. On a size label, 100 is usually the band size, as in 100C, the measurement under the bust in centimetres. In the composition line, 100 is a percentage of a fibre. Here is how to tell the difference and use the number.
What 100 usually means on a bra
On European bras the first number in the size is the band size, and 100 roughly matches 100 centimetres around the body under the bust. The letter after it gives the cup size, and the two belong together. Sizes can vary a little between brands, so always check the size guide when you pick a 100 bamboo bra.
How to measure yourself for the band
Use a tape measure around the body just under the bust, so the tape sits level and does not pull tight. Compare the measurement with the size guide for the exact bra you want to buy. If you fall between two sizes, try both and choose the one that sits better.
What a 100 bamboo bra means in the composition line
If the number sits in a line such as 100 percent, it means the whole fabric is the fibre named next to it. Many bras are a blend with an elastic fibre, so they are not made from one fibre only. Always read the whole line to see which fibres are listed and how much of each, before assuming a 100 bamboo bra means one fibre.
The same number can appear in two places
A bra can carry both a size and a composition line, and it can be confusing that the number 100 can appear in both. The size is often on the bra itself or in the neck label, and the material is on the care label. Check whether the number sits with a letter, because then it is the size.
The cup is the other half
The letter after the number is the cup size, and it is linked to the band. A 100C is not the same as a 95C, even though the letter is the same, because the cup volume changes with the band. If you are unsure, try a neighbouring size rather than guessing.
Where to find your size
Once you know your band and cup, you can look at a bamboo bra and choose by the size guide. You can also see bamboo underwear for women if you want something that goes together. Read the measurement notes for each style, because fit can vary.
The care label and the rest of the label
The care label tells you how to look after the bra, and that is an important part of making it last. Wash at a moderate temperature, preferably in a wash bag, and avoid the tumble dryer. A soft layer on top, such as a bamboo T-shirt for women, makes the day more comfortable.
Frequently asked questions
What does 100 mean on a bra
It is usually the band size, which is the measurement under the bust in centimetres, as in 100C. If the number is in the composition line, it is a percentage of a fibre.
What is the difference between band and cup
The band is the number, which gives the measurement under the bust, and the cup is the letter, which gives the volume. The two belong together, so always check both.
How do I measure myself for a bra
Measure around the body just under the bust with a tape measure, so it sits level and does not pull tight. Compare it with the size guide for the bra you want to buy.
