three-ply
From Longman Dictionary of Contemporary EnglishRelated topics: Industrythree-plyˈthree-ply adjective TIthree-ply wood, wool, tissue etc consists of three layers or threadsExamples from the Corpusthree-ply• This means that you need to use a fine yarn, two- or three-ply for standard gauge machines.• Cast on in full needle rib, using cast on two and a three-ply or similar weight yarn.