The UGG® Classic Ultra Mini is crafted from sheepskin with a flexible, ultra-lightweight sole. It's one of the most coveted classics, offering built-in flair and easy on-off wear. The UGG® Classic Ultra Mini is crafted from sheepskin with a flexible, ultra-lightweight sole. It's one of the most coveted classics, offering built-in flair and easy on-off wear. Dedicated to quality craftsmanship, UGG's iconic footwear (and apparel) define the California lifestyle with extreme comfort, multifunctional design, and an indoor-meets-outdoor appeal.