Tex 240 polyester glow-in-the-dark sewing and upholstery thread.
SewGlow™ is an innovative thread for heavy-duty sewing and upholstery. It is a Tex 240 (comparable to a #207 or #277 thread) bonded polyester which has special glowing dye impregnated into the fibers. The thread appears white when in light and glows a bright-green hue in the dark. There is no other thread like SewGlow.