A woven sleeve for routing and protecting an elongate member includes a wall having opposite edges extending lengthwise in generally parallel relation with a longitudinal central axis between opposite ends. The wall includes warp yarns extending lengthwise between the opposite ends and weft yarns extending circumferentially about the longitudinal central axis. At least some of the weft yarns are provided as bi-component yarns having a central core of heat-set material that biases the opposite edges into overlapping relation with one another, with an outer sheath encircling the central core. The central core and the outer sheath are different colors from one another, such that upon a portion of the outer sheath being split or worn, the central core becomes discernably visible.

A color-changing product includes a fabric. The fabric includes a first layer and a second layer. The first layer is arranged using at least one fiber. The at least one fiber includes (a) an electrically conductive core and (b) a coating disposed around and along the electrically conductive core. The second layer is printed onto the first layer. The second layer includes a foreground thermochromic pigment that is selectively activatable by providing an electrical current to the electrically conductive core of the at least one fiber to change at least one of a foreground color or a pattern of the second layer.

A color-changing product includes a fabric. The fabric includes a first layer and a second layer. The first layer is arranged using at least one fiber. The at least one fiber includes (a) an electrically conductive core and (b) a coating disposed around and along the electrically conductive core. The second layer is printed onto the first layer. The second layer includes a foreground thermochromic pigment that is selectively activatable by providing an electrical current to the electrically conductive core of the at least one fiber to change at least one of a foreground color or a pattern of the second layer.

Yarns including an elastomeric filament and fabrics including elastomeric filaments are described herein. A yarn may comprise an elastomeric filament and a blend of fibers, the blend of fibers comprising modacrylic fibers, meta-aramid fibers, anti-static fibers, and/or para-aramid fibers.

Yarns including an elastomeric filament and fabrics including elastomeric filaments are described herein. A yarn may comprise an elastomeric filament and a blend of fibers, the blend of fibers comprising modacrylic fibers, meta-aramid fibers, anti-static fibers, and/or para-aramid fibers.

Yarns and fabrics that include modacrylic fibers are described herein. A yarn and/or fabric may include modacrylic fibers, meta-aramid fibers, anti-static fibers, and optionally para-aramid fibers. In some embodiments, the modacrylic fibers, meta-aramid fibers, and, if present, para-aramid fibers, may each be fiber dyed, optionally solution-dyed.

Yarns and fabrics that include modacrylic fibers are described herein. A yarn and/or fabric may include modacrylic fibers, meta-aramid fibers, anti-static fibers, and optionally para-aramid fibers. In some embodiments, the modacrylic fibers, meta-aramid fibers, and, if present, para-aramid fibers, may each be fiber dyed, optionally solution-dyed.

Wool fabrics are disclosed that have improved stretch properties. The wool fabrics can be used in numerous and diverse applications, such as to make uniforms. The fabric can be designed to have greater than 15%, such as greater than about 20% stretch in one or more directions, such as in the fill direction. In one aspect, longer wool fibers are used in the fabric in order to increase durability.

A method of forming a color-changing fiber that can be incorporated into fabrics and other woven materials. The color changing fibers include an annular wall and a conductive wire axially extending through the annular wall, a core strand surrounded by the annular wall and extending axially through a central portion of the fiber, and an encapsulated electro-optic medium disposed on a surface of the core strand.

Systems, methods, and structures that provide distributed acoustic sensing using chirped optical pulses of selectable duration and bandwidth, at a frame rate limited by a round-trip propagation time of a fiber under test. Instead of processing a transmitted chirped pulse as a single sequence—our systems, methods, and structures employ a parallel fragmented multiband architecture, where each tributary correlates the received signal with a truncated chirped pulse to obtain the Rayleigh impulse response over its frequency band. By reducing the duration of the chirp processed by each tributary, spatial leakage is reduced at all the tributaries, thus even after combining all the interferometric products from all tributaries using a rotated vector sum, the resultant signal is much less impacted by spatial leakage than by using a conventional TGD-OFDR method.