i just ordered a jacket from them from temu yesterday for 15 eur, it's 25 or so on aliX. i will update my post after i've tried it.
afaik, it's a single wind stopper layer, with holes down the spine for ventilation. not overly technical but it's got pockets at the back, and can unzip from the bottom, which should beat side vents.
because it's got pockets, i'm considering using various layers underneath, not necessarily cycling specific stuff (i have various merino wool garments), and a base layer full of holes to avoid turning into a cold sponge.
Received the HISERWA jacket. Did a 3h ride w 1k+ D+, c.16 celsius today. Very pleased. It packs easily into a jersey pocket (i wore it half the time), it's got pockets, the zip can be open from the top and the bottom, which is very practical, and it's good at cutting the wind. The fabric is nice to the touch. it's got holes down the spine so it should breathe well - although unzipping will always work a lot better, ofc. The zip is easy to handle, and doesnt unzips itself when riding (happens to me with one jersey). I paid 14 eur for it, i think usually it's 20-25? Medium sizes like a medium. It's not ultra tight, but it feels just right (enough space for layers underneath, without becoming a sail in the wind - when it's zipped you dont hear it flap).
You can see from the photos it's a light jacket, single layer of fabric. it's basically a nice windstopper layer, or a vest with sleeves. And the blue is a nice blue.
Instant new favourite for me, my existing jacket doesnt have pockets, the material isnt any better, can only be zipped one way, and doesnt pack down as compact.
I can see how Rapha would sell that for 150 eur calling it minimalist streamlined shaved balls wind stopper slim cut Alpha Beta Gamma Delta Epsilon jacket.