Beginning, middle, and end (from left to right) of the IRIS prominence observation. The top, middle, and bottom rows are Mg II k, 304 Å and 171 Å, respectively. The prominence appears far more extended in Mg II k than in 304 Å, but the IRIS/SJI FOV does not cover the entire structure as AIA does. Notably, 171 Å allows us to see the high temperature PCTR that shrouds the structure.