Unfortunately, the information on the screen does not allow you to make consistent purchases. The spraycap is given as an accessory to the XD300 jacket but it is not true, the jacket is not designed to fix and contain this accessory.
I took the Spraycap with me on the Baltic Sea in Dec. '22. In my opinion, it is absolutely necessary to test the application in the dry beforehand. Handling the harness was not intuitive for me. In the cold, in the water and with gloves, it might be a little difficult to put on the good piece correctly. I can't judge how well it serves its purpose, since I didn't have to go into the water and there was only relatively little spray.