I followed random online suggestions... soak it in water with a bit of hair conditioner for 2 hours, gently wring it out, stretch it out on a towel and roll it up to help dry it, stretch it out on another towel, hang it up to dry for a day or two, cold wash it and hang it up to dry again. Honestly no idea if all those steps helped or if just getting wet was all it really needed. Mine's 100% cotton which is probably the easiest to unshrink.