I have oversized grips for my Sorel winter boots, they fit a size 11 well and I've had them for over 5 years but I've hiked icy trails with a smaller hiker so I have they put them on they worked great as always although a bit big for a camper van but stayed on the camper until the sticks and twigs caught the straps around the trunk because they were too wide and then came loose, so i ordered a large for a comfortable fit and it is, i have 11 walking shoes and i really have to stretch them to put them in the boot, even a pair of 11 tennis shoes was a stretch. So the LRG/Extra LRG seems a bit small but it fits, I wouldn't want to try on a size 13, can be difficult to fit. But I haven't hiked yet but as for the spikes I really like them, I still have the original spikes on my big grips and they hold the ice well, sometimes I wish there were 5-6 spikes up front - vs 4 , but they seem ok, you can order with extra cleats but the photos show there are 2 extra cleats on the heel which don't seem to be as effective as 2 more under the ball of the foot.
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