Whether you warm this bag up or freeze it for pain relief, the bag's clay core and double-sided construction ensure a concentrated release of heat or cold. The soft, machine-washable cover and padded interior means it's great for stress-releasing hugs, too. 12 1/2" x 6 1/2" x 2 1/4" Zip closure Removable, double-sealed natural clay core, so water is not necessary 95% cotton, 5% elastane cover Cover is machine wash, dry flat Imported Pop-In@Nordstrom