heels, flat shoes. 高跟鞋, 平底鞋

in heels 

flat shoes

Difference: Wozniacki was slightly taller than McIlroy in heels (left) and so often wore flat shoes (right)
Rory McIlroy lets his golf do the talking after Caroline Wozniacki's height dig | Mail Online
Read more: http://www.dailymail.co.uk/news/article-2698841/Caroline-Wozniacki-heels-Rory-s-career-reaching-new-heights-s-pole-position-win-The-Open-Championship.html#ixzz381epi7pz
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High-heeled footwear - Wikipedia, the free encyclopedia
High-heeled footwear (often abbreviated as high heels or simply heels)
http://en.wikipedia.org/wiki/High-heeled_footwear
高跟鞋 - 維基百科，自由的百科全書
http://zh.wikipedia.org/wiki/%E9%AB%98%E8%B7%9F%E9%9E%8B
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