The Insideout Costume is a retired costume that was released in June 2007 in Account Upgrades and then re-released in October 2017. The new AU retired November 30th. Putting this costume on a marapet will make it turn inside-out! Insideout pets are red with veins, arteries, and the pet's own skeleton. The hair should be red since it is not a part of the pet's organ system, but for certain pets the tuft on their heads would be white, signifying that it is a part of the pet's skull. The opponent Gross is an Insideout monster.