Esoteric Environment Greaves do not appear to work properly.
Took them into vBRP solo, sitting at full stamina until archer hits me with Taking Aim. Bam! Full damage 30K+ and dead. By contrast, if I block with the greaves off, I take about 15K damage. My block mitigation, according to ZOS' own advanced stat sheet, is 53%, so should be very similar. My character is not a tank. She is running 2H, not 1H+S, and not running the Bracing Anchor CP.
Also, when you put them on you get this faint green mote floating around you. This disappears when your stamina drops, certainly once the stamina gets near zero. It never reappears after that. Is it supposed to indicate the set is active? I don't know. Anyway, just to be sure, I never let my stamina drop in the first place during testing.
Update #1: They do appear to work against an Alit in Vvardenfell. In other words they do something, but they don't work for all blockable damage.
Update #2: After further testing I suspect they do not work to mitigate any channeled PvE (boss) heavy attacks. I'm struggling to see a use for these in PvE. They appear to mitigate only minor direct damage that you can easily outheal, so what's the point?
Edited by fred4 on June 14, 2023 12:40PM PC EU: Magblade (PvP main), DK (PvE Tank), Sorc (PvP and PvE), Magden (PvE Healer), Magplar (PvP and PvE DD), Arcanist (PvE DD)
PC NA: Magblade (PvP and PvE every role)