6.5 oz./sq², 100% ring-spun cotton, 24 singles; Heather Grey is 90/10 cotton/polyester; Textured, heavy weight ring-spun cotton pique; Relaxed fit; Rib mock neck collar; Taped neck for comfort and durability; Side seams; Recycled tear away label; American Apparel partners with Better Cotton to improve cotton farming globally; Made with OEKO-TEX certified low-impact dyes; This product meets the following Sustainable Style subcategories:Sustainable Materials: contains 100% BCI cotton Sustainable Manufacturing: This product meets the OEKO-TEX Standard 100 Socially Conscious Manufacturing: This product was made in a facility that utilizes the Higg Index and has implemented Level 2 practices or above, was made by a mill who partnered with Better Work, Fair Labor Association and was made in a facility that is WRAP certified.