Pillow WrapsVacs Pillow Wraps are sewn with a strong poly thread and Vacs exclusive stitching that ensures best in class durability and prevents materials from bunching up. Woven cotton outer material is filled with an extra thick poly fiber. Breathable, porous material allows air to circulate around the leg. New contour corners provides a better pillow wrap fit and helps prevent the horse from chewing pulling off the wrap while in the stall.