100% cotton for solid colors. Heather colors and sports grey include polyester. The shoulders have twill tape for improved durability. There are no side seams. The collar is made with ribbed knitting to prevent curling damage. .: Made with 100% ring-spun cotton, a lightweight fabric (4.5 oz/yd² (153 g/m²)), this unisex t-shirt feels like a bliss to wear all year round. .: The classic fit with the crew neckline deliver a clean, versatile style that can match any occasion, whether it's formal or semi-formal. .: All shirts feature a pearlized, tear-away label for total wearing comfort. .: Made using ethically grown and harvested US cotton. Gildan is also a proud member of the US Cotton Trust Protocol ensuring ethical and sustainable means of production. Fabric blends: Heather colors - 35% ring-spun cotton, 65% polyester; Sport Grey and Antique colors - 90% cotton, 10% polyester, Graphite Heather - 50% ring-spun cotton, 50% polyester