Manifer

In addition to the ordinary tilting armour extra pieces were worn : The grandguard and volant piece, very often riveted together; the elbow or pasguard, and the manifer or miton gauntlet for the bridle hand.

Source: wiktionary

(vii) The manifer (reinforcing bridle gauntlet for the tilt) was examined in cross-section. The microstructure shows tempered martensite and bands of ferrite, associated with corrosion cracks.

Source: wiktionary

Even from that distance, the Master of the Armoury could see that the gauntlets were masterpieces of construction, the left one a manifer or bridle gauntlet, designed to cover hand and lower arm on the exposed side of the jouster.

Source: wiktionary