1x1 Rib Knit - A type of fabric construction commonly used for sleeve and neckbands that is highly elastic and retains its shape. 1x1 rib knit construction is a pattern of one rib, one flat space, one rib, one flat space, etc. Both sides of this knit fabric look identical. Features: Sweat absorbing Comfortable fit Easy to wash with tap water Blend Options: 100% Cotton, Cotton Viscose, Cotton Polyester, Cotton Polyester Viscose, Acrylic, Polyester etc.