Stretchable fabric items

Abstract

Items such as wrist straps may include a knit fabric tube or other fabric outer layer having first and second knit fabric portions that form an outer surface of the strap. The knit fabric outer layer may surround an interior cavity having one or more channels. Strands of elastomeric material may be located in the channels. The strands of elastomeric material may each stay within a single channel or may weave back and forth between multiple channels while crossing over adjacent strands of elastomeric material to create points of friction. Some strands of elastomeric material may pass back and forth between the interior cavity of the knit fabric tube and the exterior surface of the strap via an array of openings in the knit fabric tube. Constraint points and points of friction may be used to control stretchability of the strap while reducing elongation over time.

Dependencies are inferred from the claim text.