You can see from the graphs at this site that relative humidity seldom approaches 100%, even on rainy days. If relative humidity were to reach 100%, sweat would not evaporate and garments wouldn't breathe or begin to dry.
FurTech garments continue to breathe in cold, wet weather because they push liquid water through the outer fabric, utilising wind and fabric movement. With their high hydrostatic head, membrane garments trap liquid water (condensation) inside.
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