Cybersoda says:
This took 2.5 hours total, one person.
Thin black tubes folded in half and braided in the length of my hair.
Larger diameter [heat-shrink] tubes slipped on over the braids and shrunken to fit.
Blue and more black tubing tied in at roots to provide more coverage.

No slipping problems at all though, the tubing is braided in so the only part Ihave to keep adjusting is the larger tubing that's covering my braids.. and I'm sure that if my undercut wasn't to my temples, sleeping on it would be AWFUL, but since it is, I never sleep ontop of any on the plastic, Ican just flop it to one side.