One side is covered with ultra-soft, plush material. Loop strap at each end provides a convenient method for holding in place. Innovative “Pearl Bead” technology delivers warm and cold therapy without any mess.Simply microwave for warm therapy or freeze for cold therapy. CPSIA and Prop65 Compliant, FDA Certified and TRA tested. Safety reports for Pearl beads are available upon request. Reusable and easily cleaned with mild soap and water. Use instructions printed on item.