4 5  oz /yd² (US) 7.2 oz /L yd (CA) 100% ring spun cotton 31 singles Heather Grey is 90/10 cotton/polyester Heather Dark Grey is 65/35 polyester/cotton Semi fitted Narrow width rib collar Taped neck and shoulders for comfort and durability Side seams Tear away label Gildan partners with Better Cotton to improve cotton farming globally 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 /div div br /div div Sustainable Manufacturing This product meets the OEKO TEX Standard 100 /div div /div div br /div div Socially Conscious Manufacturing This product was made by a mill who partnered with Better Work Fair Labor Association and was made in a facility that is WRAP certified /div /div