During the late 1920s and early 1930s, archaeologists Earl and Ann Axtell Morris discovered an abundance of sandals from the Basketmaker II and III through Pueblo III periods while excavating rockshelters in northeastern Arizona. These densely twined sandals made of yucca yarn were intricately crafted and elaborately decorated, and Earl Morris spent the next 25 years overseeing their analysis, description, and illustration. This is the first full published report on this unusual find, which remains one of the largest collections of sandals in Southwestern archaeology. This monograph offers an integrated archaeological and technical study of the footwear, providing for the first time a full-scale analysis of the complicated weave structures they represent. Following an account by anthropologist Elizabeth Ann Morris of her parents' research, textile authority Ann Cordy Deegan gives an overview of prehistoric Puebloan sandal types and of twined sandal construction techniques, revealing the subtleties distinguishing Basketmaker sandals of different time periods. Anthropologist Kelley Ann Hays-Gilpin then discusses the decoration of twined sandals and speculates on the purpose of such embellishment.