8 oz /yd² (US) 13.3 oz /L yd (CA) 50/50 cotton/polyester 20 singles The Heavy Blend collection is now made with finer yarns and new MVS Air spinning technology that improves the fabric by reducing pilling enhancing durability and creating a smoother printing surface Classic fit 1x1 rib with spandex for enhanced stretch and recovery Tear away label CPSIA Tracking Label Compliant Proud member of the U S Cotton Trust Protocol Made with OEKO TEX certified low impact dyes div div span style text decoration underline strong This product meets the following Sustainable Style subcategories /strong /span /div div br /div div Sustainable Manufacturing This product meets the OEKO TEX Standard 100 /div div br /div div Socially Conscious Manufacturing This product was made by a mill who partnered with Fair Labor Association and was made in a facility that is WRAP certified /div /div