Heat skins have orange or yellowish outlines, giving them the illusion of hot, glowing metal about to burst into flames. There are currently two skins in this family. The skins were added into the game at different times, during different updates and as a result, can be obtained from various CS:GO cases. Both of the skins come in all five exteriors and all of them have the option of adding StatTrak.
Heat skins are on the cheaper end, with the highest price being approximately around $10.
Check out other CS:GO skins families: