How to say “My heel keeps slipping out of this boot; is there a narrower fit?” in Japanese

In Japanese

このブーツ、歩(ある)くとかかとが浮(う)いちゃうんですけど、もう少(すこ)し細身(ほそみ)のはありますか。

Kono būtsu, aruku to kakato ga uichau n desu kedo, mō sukoshi hosomi no wa arimasu ka.

My heel keeps slipping out of this boot; is there a narrower fit? in other languages