How successful at tariffs in reducing imports and encouraging domestic production?

Not very if you're talking about trainers and the USA, according to this tutor2u post
http://www.tutor2u.net/economics/blog/trumps-tariff-threat-bad-news-for-us-sneaker-lovers?utm_medium=email&utm_campaign=Economics%20daily%20digest%20Fri%2023rd%20December%202016&utm_content=Economics%20daily%20digest%20Fri%2023rd%20December%202016+CID_27d030150f79e567a2e55533752bbb55&utm_source=CampMonitor&utm_term=Trumps%20Tariff%20Threat%20-%20Bad%20News%20for%20US%20Sneaker%20Lovers%20We%20will%20wait%20to%20see%20if%20the%20reality%20comes%20anywhere%20close%20to%20matching%20the%20rhetoric%20but%20the%20footwear%20industry%20is%20an%20example%20of%20a%20sector%20where%20less%20than%202%20of%20shoes