rigilene type , see through, flat, polyester boning offer high fashion support for nurse cover, caps, toy, gift designers, strapless dresses, bathing suits, arts, crafts, bra, corsets, bridal gowns, evening gowns, lingerie, swimwear, hats, handbags, plush toys, etc. polypropylene sew/woven inside and is flexible, durable, yet unbreakable. dry cleaned and washable. easy to sew by hand or machine, can be used directly by sewing garment edges, not require additional fabric to cover. clean finished. light weight and comfortable to wear.