Amon Amarth ‘Vikings Circular’ Backpatch 9.60 GBP Back Patch. Designed to fit on the back of a jacket This is a sew-on woven patch, made from cotton, with standard backing and an overlocked edge. Sorry, the product is out of stock. Share Information Reviews Back Patch. Designed to fit on the back of a jacket This is a sew-on woven patch, made from cotton, with standard backing and an overlocked edge.