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 California�s 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.