The M-Squared Breese is a large family of high-wing, strut-braced, pusher configuration, tricycle gear, ultralight aircraft produced by M-Squared Aircraft of St. Elmo, Alabama in kit form, for amateur construction.

[1][2][3][4][5][6][7][8] The M-Squared line of aircraft was started in 1996 when a former Quicksilver Manufacturing employee, Paul Mather, decided to offer retrofit kits to convert the Quicksilver II from cable-braced wings to a strut-braced configuration with jury struts.

The kits proved popular and Mather expanded to market complete aircraft based on the basic Quicksilver layout.

[1][2] The series all share similar construction featuring a bolted aluminium tube structure with the flying surfaces covered in pre-sewn Dacron sailcloth envelopes.

[1] The Breese 2 DS and SS have been accepted by the US Federal Aviation Administration as approved special light-sport aircraft.