Constructed of 90% polyester, 10% nylon = 100% cool Requires no refrigeration; simply wet with water, squeeze out the excess water, and wave the cloth in the air to activate the rapid cool down process To regenerate a dry Magic Cool cloth, rewet with any water source Perfect for fishing, trail hikes, backpacking, sport activities, adventure travel, yard work, spectator events, outdoor recreation, and sunburn relief. Size: 8" x 30"