This is from the USSEP changelog:
Glass Gauntlets are missing the Survival_ArmorWarm keyword. [ARMO:0001393A:ArmorGlassGauntlets] (Bug #36610)
This is from the Unofficial Skyrim Creation Club Content Patches changelog:
Survival: Reverted previous addition of warm keyword to glass gauntlets; they are open on the side, medium warmth was the correct setting
So should the gauntlets have the warm keyword or not?