+1 durable econo ponchos
I provided these for my own teenage daughters many years ago for once per summer one week youth group trips in Colorado mountains with rappelling and summiting a 14er. Young and frugal and good enough.
Yes, getting teens to don properly and timely any rain gear is a challenge. One June, we got snowed out at brush line on Mt Sherman not long after sunrise. During descent, one girl wanted to take an airplane back to camp. She didn’t like the hood on her jacket messing with her (wet) hair and of course wet clothes under the jacket. Hypothermia onset. Dry clothes, hot fluids and a shared sleeping bag back in camp turned that around.
Getting teens to wear sufficient SPF is similarly a challenge. Another year, I twice handed my own SPF 50 to a red headed male at rest breaks on a pristine summit day, but I did not follow through to see him actually apply. It turns out he disliked the massive blisters, ER trip, and black silver ointment on his whole face even more than he disliked the feel and look of the sunblock. I still grieve over being distracted and not observing his refusal to apply before he laid it back on my pack unused.