Maidenform Women's Pressure Free Underwire Bra Cups and backs: 82% nylon/18% elastane Hand wash cold, only non-chlorine bleach when needed, line dry, do not iron Center gore and wire channeling protect the body from uncomfortable poke and pressure Patent pending cushion wire casing system Engineered wire length to eliminate poke Encased elastics for extra comfort Self adjusting strap allows for ultimate no fuss stay in place strap