An article and method of forming an article are provided. The article includes a body portion having an inner surface and an outer surface, the inner surface defining an inner region, and at least one cooling feature positioned within the inner region. The body portion includes a first material and the at least one cooling feature includes a second material, the second material having a higher thermal conductivity than the first material. The method includes manufacturing a body portion by an additive manufacturing technique and manufacturing at least one cooling feature by the additive manufacturing technique. The body portion includes a first material and the at least one cooling feature includes a second material, the second material having a higher thermal conductivity than the first material.