1. Turn the boots over and look at the sole. You should see an official Ugg logo. Feel the Ugg logo with your fingers: it should be raised and textured.
2. Bend the sole of the shoe towards you and then away from you. The sole should be totally flexible and not feel even slightly stiff.
3. Lift the boots to your nose. Fake Uggs will often not smell of sheepskin but of dye. If you inhale a strong chemical scent, they're probably fake.
4. Turn the boots slowly around in your hands and examine the stitching. With real Uggs, the stitching will be flawless and absolutely perfect. With fake Uggs, you'll see loose threads, crooked or uneven stitches.
5. Grip the sole's width between your thumb and forefinger. Examine how wide it is. Fake Uggs will usually be around 1/4 inch and real uggs clearance will be closer to 1/2 inch wide.
6. Grip the Uggs by the top part of the upper portion of the boot. Try to roll the boots down. With real Uggs, rolling them down should feel easy and nearly effortless. With fake Uggs, it will feel like you are fighting against the material.