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when they get worn in the tread,I get out the angle grinder and put on cutting disc and add lots of grooves in the treads...keeps me from falling on my arse for a bit longer.

they are neither fish nor fowl.....grip is similar to old john bull commando boots and they are padded so the sheds water bit isnt there....

leave them as they are and wear tall gaiters over the top..will last much longer as dont get ripped up by lawyer etc as badly
try CRT and Wrightsons or farmsource...all the farm supply folks usually...