4.2 oz., 100% combed and ringspun cotton; 30 singles; Athletic Heather is 90/10; Dark Grey Heather is 52% combed and ringspun cotton, 48% polyester; Retail fit; Sideseamed; Tear away label; BELLA+CANVAS uses sustainable manufacturing processes with Blue Sign certified dyes, efficient dye houses that adhere to the state of Californiaís EPA regulations around waste water treatment and usage, and cutting facilities in Los Angeles that run on partial solar power with comprehensive recycling programs for paper waste and fabric scraps.;