Irish Knit sweaters were inspired by the Irish fishermen in Ireland. The wives would knit the sweaters with many different stitches like the cable which signified the ropes the fishermen used. These sweaters are 100% acrylic and come in sizes 6"-16". Machine washable. To determine size, measure from the base of the neck to the base of the tail. For dogs with a little more weight or fluff, go up a size.