Shorter than a standard Buff and more highly-wicking - the fabric is Fastwick Extra (also claims to be less whiffy). It is intended for use under helmets or just as a head band.
It also works quite nicely as a face cover, as it's less bulky when doubled over but pretty comfortable. So if you are a mask-user in public, indoors locations then it might appeal.
We stock this item in orange so that it stops people wearing in this way from looking too much like bank robbers!