Sherpa is the name of a type of fleece fabric made of polyester that is a variant of stretch knit fabric. It has two different sides, one side is smooth and knitted while the other has a texture that imitates the fleece on a sheep’s back. They are named for the Sherpa people of Nepal who wear wool-lined jackets which are smooth on one side but have a soft woolly texture on the inside and are noted for their warmth and durability.
Many suppliers can produce Sherpa custom blankets based on designs or patterns that you supply. You simply send them details of your design and they will take care of the printing and creation of your blanket. They can be used as personalized gifts or for marketing purposes. There are many print-on-demand sites on the web that offer these services for Sherpa blankets.