From Pathfinder Lost Omens Impossible Lands, which isn't enabled.

Tough Skin

ITEM 1

COMFORT

Bulk —

Category medium

Group plate

AC Bonus +4

Dex Cap +1

Strength +3

Check Penalty −2

Speed Penalty −5 ft.

Note Tough Skin ancestry feat only

Your skin is medium armor in the plate armor group that grants a +4 item bonus to AC, and has a Dex cap of +1, a check penalty of –2, a Speed penalty of –5 feet, a Strength value of +3, and the comfort trait. You can never wear other armor or remove your hide. You can etch armor runes onto your hide.

Pathfinder Lost Omens Impossible LandsOGL