First appearing in Friday the 13th Part III, Jason Voorhees' hockey mask has become his most prominent trademark. Though first appearing as a normal Detroit Red Wings mask, it has gone through several design changes throughout the series.
The hockey mask does not appear in this film. Instead, Jason uses a simple burlap sack with one eyehole cut out to hide his face. This sack is lost during Jason's fight with Paul Holt and Ginny Field.
Making his way to Higgins Haven, an unmasked Jason breaks into a store owned by a couple named Harold and Edna, stealing new clothes and eventually a hockey mask to hide his face. In this film, the mask has a red arrowhead triangle in between the eyes, as well as two red triangles on either side of the nose.
Virtually unchanged, the only real differences are a crack in the forehead from Chris Higgins' axe, and the triangles on the sides of the nose are barely visible.
As Jason does not appear in this film, the main antagonist is Roy Burns, though his hockey mask is visually different. The mask is more circular, and there are two blue triangles on it instead of three red ones.
Jason's mask is in the possession of Tommy Jarvis at the beginning of this film, and he attempts to cremate it along with its owner. However, Jason dons it once again when Tommy accidentally resurrects him. The mask is noticeably dirty, and still retains the axe crack from Part III. Only the top red triangle remains on the mask.
Jason's mask is visibly cleaner in this movie, and the top triangle is a darker shade of red. In addition, a small chunk of the mask is cut out from the damage caused to Jason's face and neck by Megan Garris' motorboat propeller. Jason's mask is destroyed during the climax of the film by Tina Shepard, who uses telekinesis to tighten it until it splits in half.
Upon his resurrection in this film, Jason acquires a new mask on board the Lazarus. This mask is more of a yellowish color, is much wider, and amazingly also has the axe crack, though it is much more narrow. The two bottom triangles are back, but are thinner and facing in the opposite direction.
By the time of this film, Jason's mask has been heavily damaged, displaying numerous cracks and missing portions in addition to the axe and motorboat damages from the previous installments, and once again only has the forehead triangle. The mask also appears to have fused itself to Jason's face.
In this film, Jason's mask appears far more angular, and lacks the round nose from previous installments. Once again, it only has the forehead triangle, and once again retains the axe and motorboat damage, though these are much more subtle.
When Jason is transformed into Über-Jason, he once again wears a hockey mask, but it is composed of a metallic alloy and conforms around his face. The holes are also positioned differently, and it appears to have nostrils.
In this film, Jason's mask appears similar to the one in Part III down to the three red triangles, but it now appears to be cream-colored rather than white and it is notably missing it's signature axe mark..
In this film, Jason acquires his mask after his burlap sack is removed after a brief fight with Donnie. It appears similar to the one from Part III, although it is more dirty and worn-out, and the triangles are peeling off.