4 Top-seams. 100% acrylic. Pom-pom on top. 3'' cuff. Dark Heather Grey 50/50 acrylic/polyester. Light Heather Grey is 62/38 acrylic/polyester. Dark Heather Grey/Black, Dark Heather Grey/Navy & Dark Heather Grey/Red are 74/26 acrylic/polyester. Royal/Light Heather Grey is 82/18 acrylic/polyester. All other Heather colors are 50/50 acrylic/polyester.