Alas, once again, Paramo rain gear is denied consideration. I can't understand the resistance to it; it fundamentally works differently to all other forms of WPB technology and I'd think people would at least give it a proper try. It's has it's drawbacks... it's heavy and, for some, too warm. Personally I find that it does, by including the pump liner (it doesn't use a membrane of any kind... it works on the physics of the fibers in the liner mechanically pulling water from one side of the fabric to the other...and not chemically, as hydrophobic and hydrophilic fabrics do, though adding the DWR treatment that it is designed for, makes it much more effective) exactly what the fear of hypothermia in wet environments is trying to prevent: keep you warm. If it is too warm to wear a shirt underneath, just remove your under layers and the jacket is soft and pliable enough to wear on it's own. But in most rains that I have walked in, the ambient temperature is either chilly and therefore requires some kind of insulation, under most rain garments, even if it is light, or else it is warm enough to walk without anything waterproof, in which case my movement will generate enough heat to evaporate what moisture my clothes have accumulated.
Maintaining the DWR treatment is an easy thing most of the time... just throw the garment in the washing machine with the Nikwax TX-Direct Wash-In and let the garment dry afterwards (no ironing). Out in the field long term, however, finding a way to get the DWR treatment in, might be a challenge. However, Paramo still work when the DWR treatment is gone... just not as effectively.
This, from http://www.gooutdoors.co.uk/expert-advice/guide-to-waterproofing-:
"Advanced Moisture Management - Paramo
"This is a membrane where the outer layer sheds most of the water. When water penetrates the outer it comes into contact with the “pump liner” or drop liner, which forces any moisture back out of the jacket. The “pump liner” effectively dries faster than it can get wet as the waterproof element is within the lining.
"Paramo works like the fur of an animal whereas conventional waterproofs work more like a sheet of plastic. There are three constituent components: two layers of fabric and a waterproofing agent. The fabric is impregnated with Nikwax TX Direct treatment that leaves a water-repellent finish on each individual fibre so that the outer layer, as well as being fully windproof, will deflect at least 90% of water that hits it.
"This unique system of water transfer control, insulation and waterproofing is derived from observations of how an animal’s fur works. The inner layer is a very short-haired fleece which is reversed, so that as water enters the fleece and moves down towards the base of the fibres, it comes under increasing pressure; eventually it cannot get any further and is pushed back up the fibres.
"In addition, the waterproofing treatment causes the garment to treat water directionally, so that any water that hits it is deflected. It also means that any moisture that is created on the inside will be drawn away.
"Advantages of Paramo
"Paramo is extremely breathable: no matter how hard the wearer works, or how much they sweat, body moisture will be moved away. Due to the way it functions, and the type of fabric used, fewer layers of clothing are required underneath. Paramo jackets do not appear to have a finite life: as long as they are periodically reproofed (about every 12 months) by washing with either TX Direct or Granger’s Extreme and then tumble-dried, they will keep on working.
"For comparison, a Gore-Tex or other membrane jacket will have about an eight-year life and a coated jacket five or six years, before they are worn out. Punctures do not harm the material and rips can be easily repaired.
"Disadvantages of Paramo:
"The material is comparatively heavy. It is questionable whether it is sufficiently durable to be recommended for serious mountaineering use. It has no hydrostatic head. When it needs reproofing water can be pushed through the fabric, e.g. by the weight of a rucksack; however the water will disappear soon after the pressure is released."