Targeted Pain Relief - These small ice packs allow for customized therapy with placement over sore muscle groups like arms, legs, or back. Hot and Cold Versatility - Boil or microwave packs to heat them up or put them in the freezer for ice cold therapy to relieve swelling, stiffness, spasms, or arthritic pain. Soft, Flexible Comfort - Whether heated or cooled this ice packs flex and conform to fit your body, while the soft exterior is safer and gentler on even sensitive skin.