I was able to do this to the M50s
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Do you have a link to specific sleeving you're referring to?
Techflex multifilament sleeving that I used is nylon, and it's quite soft (described as "fabric-like").
Regular Techflex that's for sale most places is what they call Flexo PET, which is monofilament polyester. That stuff is very stiff. I would not recommend monofilament polyester sleeving for headphone cables, but it's fine for interconnects, speaker cables, and other wires that don't often get moved around.
Try using paracord or shoelaces :)
I found a box at home from his shoes and discovered there spare laces, orange, very soft. I will use them to create interconnects, since they have a large diameter.
Nylon can be different for softness.
I think it's easier to use shoelaces. They are a wide variety of colors and sizes. They are made of textiles.
Edited by maximuslt - 2/24/13 at 5:27am