three-ply

from WordNet (r) 3.0 (2006)

three-ply
    adj 1: having a thickness made up of three layers or strands;
           "three-ply cloth"; "three-ply yarn"

from The Collaborative International Dictionary of English v.0.48

Three-ply \Three"-ply`\, a.
   Consisting of three distinct webs inwrought together in
   weaving, as cloth or carpeting; having three strands;
   threefold.
   [1913 Webster]