In primitive societies it provides a weaving device at very little cost. Even in the more advanced countries it is used. It is very portable. It can be set up and used almost anywhere. The primary feature of the back strap loom is that the lengthwise threads (warp) are stretched from a fixed device such as a post or tree to a belt that a person wears around their waist. By backing away from the post or tree, the user can pull the warp threads into tension. In order to weave, the threads must be stretched in a horizontal direction and a means must be provided so that the threads can be separated into two (or more) parts so that a weft thread can be passed between the two sets of threads. The two sets of warp threads can then be reversed and a weft thread passed through again. By repeating this process, fabric can be woven. Using the backstrap loom, a weaver can produce fabric with a plain weave. Most simply, this is an over-under-over-under pattern.
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