Looks good, looks robust.
Perfect, especially for the price. head is well maintained against backwards motion. Back is well protected also. Used a 45g CO2 cartridge for life jackets, it's the perfect size for type 4 jacket (one with the flap that protects lower back). Sourced my cartridge from Nautisports in France for 13€ each. For size I took the same as the leather jacket , XL it is. I'm 1.83cm tall and weight around 80kg. Seemed a bit loose at first when deflated, but once pop open it maintained
The vest is of very good quality, for a price It inflates in a few fractions of seconds, it's impressive! Then we're all compressed from everywhere. I chose a size XL, I measure 1m87et weighs 75kg. Be careful the size chart does not match at all, before ordering I asked the opinion of the seller and he advised me rather an L. The vests cut large and he was right an L would also have enough for me. The seller is very responsive and responds quickly, thank you to him. For co2 cartridges, 33gr is largely enough for an XL. You can find on airsoft sites. The manual is in Chinese, but no panic take the Google trad app and make the instant translation with the camera