Set of 2 hand warmers. 100% cotton material and thread makes the outer shell, and inside is flaxseed. Microwave for 30 seconds and have toasty hands this winter! Whole flaxseed provides a gentle, moist heat which promotes healing. Flaxseeds are flower seeds, rather than grains, so they contain 30-40% oil which remains inside the seed to be warmed again and again. Other products lose their ability to retain heat as the water cooks out of them over time.