It's not comfortable to wear shoes.The shoes are made of leather.合并成一句

It's not comfortable to wear shoes.The shoes are made of leather.合并成一句
It's not comfortable to wear shoes.The shoes are made of leather.合并成一句

It's not comfortable to wear shoes.The shoes are made of leather.合并成一句
It's not comfortable to wear the shoes made of leather.

It's not comfortable to wear shoes which are made of leather.

你好！

It's comfortable to wear shoes made of leather.

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It's not comfortable to wear shoes (which / that are ) made of leather.