Aruvo sewing thread and pre-wound bobbins are made from premium PTFE fiber to extend the life of your sewn seams. Standard thread can break down over time from sunlight, wind and the outdoor elements, but Aruvo retains its strength and flexibility after years of UV and sunlight exposure, unaffected by salt water, acid rain, or extreme temperatures. You can depend on Aruvo for long lasting, fade resistant color that will not stain or transfer to surrounding materials.