Find UGG Classic Ultra Mini Leather Ankle Boots on Editorialist. UGG's 'Classic Ultra Mini' leather ankle boots are part of the 'Regenerate' collection, which utilizes materials sourced from farms that implement regenerative practices. They have raised, contrasting seams and handy pull tabs on the heels. The warm UGGplush™ lining is made from partially upcycled materials, while the sugarcane EVA™ soles offer a cushioned feel.