Hailey Terrywrote a review of Arc'teryx Zeta SL Jacket - Women's on October 1, 2019
Familiarity: I've used it several times
Fit: True to size
This jacket is an incredible rain shell. It's extremely lightweight but completely waterproof. I have worn this multiple times out in the rain and it's worked great. I love the fit of it personally. It's a little bit longer in the back which I love because it keeps my butt dry and looks cute too. It does get a little bit tapered which I also like, but I ended up sizing up in it so I can wear it in the winter over my down jacket. But it definitely fits true to size with a little room to layer underneath.
Being so lightweight, it is really compactable. It's so easy to throw in my pack if I'm at all unsure of the weather. It doesn't have pit zips (the LT does) which keeps it lightweight and perfect if you're trying to cut ounces in your backpacking set up. I'm not a huge fan of pit zips because I think they can get uncomfortable so I like not having them.
Overall, I love this jacket and think it's perfect for any rainy day. I've mostly worn it in cooler weather, but think it's going to work great in the spring/summer because it's so light.