Science Candy Hearts SweatShirt, Cute And Funny Gift For Science Teachers, Scientists, Women In Stem, Lab Techs, Geeks And Nerds About the SweatShirts Ideal for any situation, a unisex heavy blend crewneck sweatShirt is pure comfort. These garments are made from polyester and cotton. This combination helps designs come out looking fresh and beautiful. The collar is ribbed knit, so it retains its shape even after washing. There are no itchy side seams on these sweaters. Made with a medium-heavy fabric blend of 50% cotton and 50% polyester (8.0 oz/yd² (271.25 g/m²)), this sweatshirt feels cozy and is the perfect choice for those colder months. Made using 100% ethically grown US cotton. Gildan is also a proud member of the US Cotton Trust Protocol ensuring ethical and sustainable means of production. The blank tee's dyes are OEKO-TEX-certified dyes with low environmental impact. Fabric blends: Heather Sport colors - 60% polyester, 40% cotton