I got ahold of a copy of Barber's The Mummies of Ürümchi (New York: W.W. Norton, 1999), looked up språng in the index, and went to the page.
Two women wore black hairnets that may or may not be made in språng. That is all. She adds a footnote defining språng and states that it is still done by "elderly peasants in parts of Greece, Scandinavia, and Central Europe." (p. 200)