What role do the dimensions A and B listed in the neck gaiter specifications actually play when wearing it?
In the detailed information for the Alpha Direct Neck Gaiter 90, the dimensions are only listed as A 31cm and B 26cm. It is not specified whether they measure the width or height, making it difficult to gauge how it will function when actually worn.
To address the dimensions first, A is 31cm and B is 26cm, and they serve as the standards that determine the range for wrapping around the neck or covering vertically[1].
LITEGEAR HOUSE provides three figures for this neck gaiter[2][3]: dimensions A 31cm and B 26cm, and a weight of 25g[4][5]. However, the product guide does not explain whether A and B specifically measure the flat width or the vertical height.
Generally, in a tubular neck gaiter, the two dimensions refer to the flat cross-sectional width and the vertical length when laid out. The width determines the roominess of the circumference for slipping it over the head and wrapping around the neck, while the vertical length determines the vertical coverage from the collarbone up to the chin or nose. Whether either dimension corresponds to the circumference or the height, 26cm and 31cm are generous enough sizes for an adult to sufficiently wrap around the neck and cover the lower face.
It is lightweight. At only 25g, it carries little burden whether worn around the neck for long periods during outdoor activities or carried in a pocket[6].

Official materials have not yet confirmed which specific parts between flat cross-sectional width and vertical height dimensions A and B respectively measure.