It's made of polyester and nylon blend that's 160 gsm thicker material. It uses the moisture from the towel to draw sweat away and keep you cool instantly. The rag stays cool for hours. The fabric provides a comfortable silky feel and it's skin friendly, extremely absorbent and chemical-free. To use it, simply soak the clothes wet in the water, wring out excess water, shake a few times, and use it for instant chill.