This is like Wyvern Leather ; made from Wyvern Hide - and providing Poison Resistance and an extra +1 to Armour Class ; but as it is studded in Adamantium it provides even more protection - AC + an additional 2 points.  But the Adamantium studding is not sufficient to provide immunity to critical hits.  It still counts as Light Armour so full Dexterity bonuses apply.

Made from tough but flexible leather, studded leather is reinforced with close-set rivets or spikes.

Notes: Bonus: Armor Class, Resistance: Poison