I only wear Crocs Mammoth...they are fully lined and are so warm. I wear them all year round... the lining comes out and can be machine washed and air dried.
http://www.crocs.com/products/women/mammoth/
I have 5 pairs now....
They also make these for men and children...
I know...they are not the best looking shoes but they sure are comfy.

Abbie
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My avatar pic is my beautiful
niece Ashley!
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Rest in Peace
3/8/90 ~~ 4/2/12