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I won‘t tape them up cause I like the extra ventilation but I read on alee denham‘s page that he‘s using over shoes over sandals in cold conditions which sounds like a good idea to me.
So far I haven‘t really had many problems with debris, water or cold. When sand gets in, it gets out again just as easily. And woolen socks kept the temperature enjoyable even in temperatures around 0 degree celsius.
Bit of gaffer tape to make them waterproof again, Bob's yer uncle.