This was my senior studio thesis project for my BFA in 1990. It is a hand-doubleknit scarf, fully reversible as you can see. Some of the yarn was handspun by me: The fuzzy carmel colored one is Collie (leftovers from a commissioned sweater/blazer that I spun/designed/knit~ I can't find pictures of that creation, don't ask)
The scarf is NOT a tube, but a flat piece of fabric. Similar to double weave, but identical front and back, where as doubleweave is the reverse front to back...like a negative. It is approx 7 feet long and mainly wool, silk, collie, angora, with a little linen, mohair, and rayon thrown in. It has held up pretty well for 16 years of use (although I keep it for "special" as you can imagine).
PS: The collie yarn is fabulous: Incredibly soft and furry, doesn't shed...you just want to "roll around nekkid on it". The sweater/blazer was done for a collie breeder who wanted something to wear while showing his dogs in the cooler months: It was a shaped cardigan like a blazer with a shawl collar: Made in sock weight collie plied with a fine tussah silk. It was gorgeous, and he had it lined. I don't know how warm it was: It was done to his measurements, and he was vastly smaller than me.