Gear Hub fan
Join Date: Nov 2008
Location: Reno, NV
Bikes: Civia Hyland Rohloff, Swobo Dixon, Colnago, Univega
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All helmet straps I am aware of are Nylon webbing or similar synthetic webbing material. It is flexible and porous. As long as you sweat the straps will get sweated on and whether porous or not will get cruddy with salt from your sweat.
The strap material is chosen based on flexibility, softness for comfort against the skin and strength. The strength requirement is part of helmet test standards. Nylon/synthetic straps are used on all motor vehicle and bicycle helmet straps I am aware of.
You might try a waterproofing spray on the straps. I have no idea how effective it would be.
Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro
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