Bing found the following results
UGG® Sizing Information | UGG® Official
Women's Size Guide | UGG.com
Men's Shoe Size Guide | UGG.com
Ugg size chart and fitting guide for perfect sized UGG boots
UGG Footwear Size Chart - Hibbett | City Gear
UGG® Size Chart | UGG.com
What size UGGs should I buy? – Ugg
UGG men's and women's size chart | RunRepeat
UGG Shoe Size Charts | Size Guide | Shoe & Sizing
UGG Size Guide | The UGG Shop® - The Official Online Store