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micro spikes are the best I've found. They are a breeze to put on and take off & snow doesn't gather. By far the best I've found but are a bit pricey.
I screw sheet metal screws into the soles. Five on front of sole and three at the heel. Just stay off the hardwood floors.
hillsound trail crampon pro they run around $85 a pair but well worth every penny. have had mine for three years now and are as good as new
I bought some Maxigrip Ice Studs HM11 last year and have been very happy with them. Looks like they may be the same as the Grip-it screws from Woody's. I put 12 per boot but could use maybe 5 or 6 more per boot.The maxigrip come 24 per pkg the Grip-it 25 per pkg (I guess you could put 1 extra per shoe). The Grip-its are 13 mm and the Maxigrip are 11 mm.
X2 without a doubt comfy and you walk flat footed , and for something that will last for years ,it's a good investment