You can wear the blitzen convertible two ways folded down or turned up the warm fleece lining feels good all year round and then you can flip the liner up giving you more of a bootie style with more coverage and warmth above the ankle two different looks two great ways to enjoy crocs comfort blitzen convertible details wear it two ways folded down or turned up toasty fuzz lined synthetic leather liner croslite material base is incredibly light and comfortable rubber outsole pods i