등산복이 · 등산복을
hiking clothes, outdoor wear
Example
주말에 산에 가면 화려한 등산복을 입은 사람이 많아요.
When you go to the mountains on the weekend, lots of people are wearing colorful hiking gear.
Word parts
등 climb+산 mountain+복 clothes
등산 'hiking' + -복 'clothes' (as in 한복, 교복).
Good to know
Bright, high-tech outdoor wear is famously popular in Korea, and many middle-aged people wear it even off the trail.
Related words