double welt

double-lock seam

double-lock seam
A type of seam between the edges of adjacent metal sheets; formed by making a double fold, then dressing down to form a seam.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Main knitting features include: single or double welt by means of transfer jacks in various selections with knitted, floated or laid-in elastic; 3-way knitting on 8 feeds, 2-way knitting with 1 colored ground yarn, extra-clear patterns, laid-in.