Absorbent PVA material accelerates cooling process. Simply soak with water, wring out excess, and snap and shake to activate the cooling process. Designed to wear around the neck, stays cool for hours. When the band begins to dry, simply wet and reuse. When finished, store the band in the Cold Snap[TM] storage tube for future use. Machine or hand wash, air dry. Anti-microbial treated to prevent mildew and odor. 29.5" x 4".