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