Armia is coming off his most productive season points-wise in the NHL ranks, setting single-season highs in all three major offensive categories with 12 goals, 17 assists and 29 points in 79 games.
He also appeared in 13 playoff games for the Jets during their run to the Western Conference Finals, chipping in with a pair of goals.
The 25-year-old right-winger, who hails from Pori, Finland, was selected 16th overall by the Buffalo Sabres in 2011.
In 180 career NHL games, Armia boasts 26 goals and 58 points.
For his part, Mason appeared in 13 games for the Jets during the 2017-18 campaign, posting a 5-6-1 record, along with a 3.24 goals-against average, a .906 save percentage and one shutout.
Over the course of his career, the 30-year-old Oakville, ON native has also played for the Columbus Blue Jackets - who drafted him in the third round - 69th overall in 2006 - and the Philadelphia Flyers.
He boasts a record of 205-183-64 in 476 career appearances in between the pipes, along with a 2.70 goals-against average, a .911 save percentage and 34 shutouts.
Simon Bourque, meanwhile, was a sixth-round pick of the Canadiens - 177th overall - back in 2015.
In his first full season in the pros in 2017-18, the 21-year-old defenseman registered three assists in 46 games with the AHL's Laval Rocket.
