⭐ If you are buying the Classic sheepskin boots, go down to the nearest whole size. They should feel like a firm hug at first; the sheepskin will eventually create a custom footbed just for you. If you'd like to narrow this down, let me know:
Your toes should not be curled or painful, but the boot should feel very "firm" initially. If your heel is slipping when you walk in the store, they are too big. Exceptions to the Rule
For the (the iconic tall, short, and mini boots), the consensus is often to size down .
Which are you looking at (Classic, Ultra Mini, or a waterproof boot)? Do you usually wear half sizes or whole sizes ? Do you prefer wearing them with or without socks ?
UGGs with zippers, heels, or rubber-heavy constructions (like the Adirondack) often have less "give" and run true to size.