During the behind the scenes footage for ASTRO‘s “ONE” music video, Cha Eunwoo revealed the cute way he stays warm on cold sets.

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| ASTRO/YouTube

There’s not much idols can do to battle the cold from shooting early morning or late night aside from putting on a jacket in between scenes and using a hot pack. So that’s exactly what Eunwoo does, but he has an extra little trick on how to stay warm: it’s all about the placement of said hot packs that can make a difference.

He cleverly put them in pockets on the inside of his jacket! But he had one more secret location that made us all laugh: in his pants.

It’s certainly an ingenious location!