Irwin mango is a cross between the Lippens and Haden cultivars, selected by F.D. Irwin of Miami, FL in the 1940s. 
The trees were observed to be low growers with spreading growth habit and produced a small-to-medium sized oval shaped fruit with a gorgeous crimson red blush. The flesh is fiberless, soft, and has a very mild flavor in the classic group. The trees  are quite productive, particularly near the coast.  It is an early season mango.