The Sportsack is a must have accessory to keep your hands and disc dry while maintaining a consistent grip. Simply roll the bag around in your hands for a few seconds to soak up any moisture and oil to restore your natural grip. Each 100% cotton bag is filled with thousands of super thirsty Beadsorb beads. These beads are so effective they can dry off wet discs in a flash and can even be used in the rain. The Sportsack does not leave behind a chalky dust or messy residue and lasts much longer than rosin bags or other powder based products.