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For training purposes in cooler weather:
ANY material can be overloaded by sweat
- i.e. going all out, racing, will soak the material
Those breathable garments on the market work
on water vapor, not on sweat droplets, getting out.
IF a material lets sweat droplets out
- it is not waterproof to begin with.
Don't let me discourage anyone from the
breathable fabrics, they are wonderful stuff.
They will also ""dry" nicely if you slow down
from doing sprints and paddle quietly for
a recovery period.
To gain better understanding, look for stuff like this.
It explains exactly how the fabrics work
and its all based on water molecule size - vapor vs liquid
DON'T let the marketing hypesters dupe you though.
All fabrics have limits, and you will sweat going full tilt.
Maybe listening to people saying that "its all based on water molecule size - vapor vs liquid" is not the best of ideas. The size of water molecule in a block of ice, a jug of water and a cloud of fog are exactly the same - hard to believe, but amazingly true. The key words here should be "wetting", "hydrophobic", "surface tension" and "diffusion".
The essence of any "membrane" out there is that it is basically a spider-web of hydrophobic "threads" that are packed close enough to be impermeable to liquid water due to the effects of surface tension (the fibers are not wettable). However, the spaces between the fibers allow water vapor (individual water molecules - for simplicity sake) to make their way though the membrane. The speed of this transport is dependent on the properties of the membrane and also on the temperature and humidity gradients across the membrane - if the outer layer of the "breathable" fabric becomes wet (saturated/covered by layer of water) the rate of diffusion will drop by order of magnitude, if not more. This is why all "breathable" fabrics have some sort of water-repellent coating on the outer surface - not to add to the water-resistance, but to keep the outer surface "dry" so to allow vapor to escape.
If you read somewhere that "our membrane" allows (liquid) sweat through, rest assured, it's hogwash - because if the membrane is wettable and permeable to liquid, it's wettable in both directions - ergo, it is not water resistant.
Long ago I had a ""ring"" made of clear tubing
that could go around my neck seal to open it up
to cool air, making it more comfortable.
In rough conditions I could flip the neck seal up
and be protected almost instantaneously.
It's in a box...somewhere and would take
hours to find now, no pictures or brand name,sorry.
Anyone else know what I'm talking about here ?
Found an internet pic of something similar
The ring acts a bit like a vent on those nice
rain jackets with the ""pit zips"" allowing ventilation,
only it's around the neck letting heat escape.
Just remember it's around your neck or it
could cause all that water to rush in and
be downright fatal ! It's a bit of fatal catch 22.
Meant and designed for on-land gear gathering,
portaging, walking around, comfort during breaks, etc.