I thought that women's boots are for fashion and beauty, whether they are thigh or ankle high. But I realized a real function of boots after I moved to here a snowy area. It prevents water and slippage. Usually I wear sneakers, but they are very slippery in snowy roads.
I purchased a pair of ankle boots at wal mart when I visited Portland, US, last October.

I never thought they could provide any practical function. Nowadays I wear them nearly everyday to walk in snowy and frozen roads here. They costed just $20! I should have purchased long thigh-high boots there, too!
Moreoever, the boots look so plain, and nobody here asks whether they are for women or men, as many men here wear shoes with 1-2 inch height of heels. Mine is about 3 inch, but so much unnoticeable.
Barbie~~