I was using a 7+ year old Patagonia Goretex hard shell until recently, which I replaced for a similar jacket using the H2No treatment. The H2No appeared incredibly
hydrophobic with water just beading and running off it, and never soaking through. It is a highly breathable jacket, but tbh, no more water repellent nor breathable than the old one which I retreated before the final season before retiring it.
Edit: on further reflection the H2No is more breathable, but that's is compared to an old jacket |