Reusable thermogel fabric bag with washable cover, which contributes to the well-being of muscles and joints. It can be kept in the freezer to provide a cold and anti-inflammatory effect, indicated for bruises, sprains, strains or headaches among others. It can also be immersed in boiling water or in the microwave, to achieve a heat effect, ideal to help relieve joint discomfort or relax contracted and sore muscles.