Homemade red-heel sock monkey dolls usually have unique faces and body characteristics and are considered one-of-a-kind. Sock monkey dolls are also mass-manufactured in the marketplace. Sock monkey dolls mass-manufactured by a company normally all have the same face and body characteristics. Not all sock monkey dolls are created from red-heel socks. A 2015 book shows that more colorful sock monkeys have become a trend, such as monkeys made from socks with multicolored striped or polka dot patterns, and monkeys made from mismatched socks.