Get free shipping and sales for the Ugg Swell Natural Footwear Available in whole sizes only. If between sizes, order a half size up. ; A new addition to the Surf Collection, the ‘Swell’ is a functional and stylish boot. Rich suede upper detailed with Tasman braiding and the UGG Australia sun logo on the side pulls. The boot shaft is lined with 8mm Merino curly sheepskin for a warm and cozy environment for the foot. Comfortable leather on top of a squishy Poron footbed makes these boots feel decadent on the feet. Molded rubber outsole with ribbed traction pattern provides stability and feminine appeal. Please Note Slight dye transfer may occur with darker colored sheepskin during first few wears.