Poly Rayon is at its weakest state when wet. Best washed on a gentle cycle in cold water or hand washed. Dry in dryer on low heat or cool(heat will shrink your garment). DO NOT hang dry it will strain the fibers and stretch.  If you want to air dry it needs to be layed flat. Remove from dryer immediately to avoid wrinkling. If you need to iron it do so on lowest setting with no steam.