It's not so clear, sometimes the kastam will hold it because they just feel like it. Very annoying. However my friend sent me clothing only 2 weeks ago and it got through ok.

Also, unless your shoes are very expensive, the shipping might cost more than the shoes! And if you're using cheap shipping methods (ie. stuff other than Fedex/DHL) then there is a slight change of you losing your stuff in the mail.

Good luck.