Brand: Reformation Style: Mikayla Ballet Flat Color: Almond Ivory Size: 8.5 (US Women's) Condition: Never worn Retail: $248 From Reformation. High-quality supple glove nappa. Square toe. This is a bovine vegetable tanned or chromium-free leather. Up to 90% of the world’s leather goes through a process called chrome tanning, which produces hazardous waste and is a human carcinogen. Unlike chrome tanning, vegetable tanning replaces chromium for natural things like bark or plant tannins.