Hi Mike,
The HJC IS33 has stayed dry inside when the rain was moderate and short lived. On my ride home from XSSE 8 hours in heavy to torrential rain the front edge got wet but not uncomfortable.
Water found a way past my waterproof jacket too and that was uncomfortable
I would not ride with a helmet on the helmet lock as that is not it's purpose.
A top box or the elastic net that secures helmet to saddle are options for carrying alternate helmet.
Phil
The HJC IS33 has stayed dry inside when the rain was moderate and short lived. On my ride home from XSSE 8 hours in heavy to torrential rain the front edge got wet but not uncomfortable.

Water found a way past my waterproof jacket too and that was uncomfortable

I would not ride with a helmet on the helmet lock as that is not it's purpose.
A top box or the elastic net that secures helmet to saddle are options for carrying alternate helmet.
Phil
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