HFG is quite right Jo, I used bread bags myself as they've no holes
But I now use this stuff
http://www.nikwax.co.uk/en-us/products/productdetail.ph...abricid=-1
It can be applied direct onto "wet" boots & gloves
I can recommend all Nikwax leather & fabric waterproofing products
Only trouble with placcy bags on yer feet, is they can make em sweat
So you end up wi wet feet anyway
Maybe it's significant, that it's yer "left" boot that's leakin
As that's the one which "flexes" most due to gear changing
So maybe the area around where yer boot makes contact wi the gear lever is the culprit