This neck cooler is made from cotton or poly/cotton blend material and filled with beads that swell up when placed in water (about ½ hour, do not leave in much longer. The neck cooler should be round but not too stiff). Place around your neck in hot weather and tie the ends. When the neck cooler warms up, replace with a cold one and put the other back in the ice chest to get cool again. It is usually best to have two so one can be kept cool at all times. Hand wash then place somewhere to air dry. Once completely dry (can take a week or more) the beads may feel a bit bumpy, but will swell up again when placed in water. Store in a plastic zip bag when using. Comes in various colors: please allow us to choose.