This probably seems like the glaringly obvious and most important way in how to prevent blisters and in many ways it is. Firstly ill look at socks as after all they are footwear. As blisters are caused by friction and rubbing on the skin a way to prevent blisters in to use an extra pair of socks. You can buy socks that are ultra thin which can be worn under your hiking socks and make little difference to the volume of sock around your foot, the ones I bought are the Bridgedale Coolmax Liner. This means the two layers of sock rub against each other rather than against your boot, so that's the first and easiest way as to how to prevent blisters when it comes to footwear. As an outer sock I went with the Bridgedale Wool Fusion Trekker. There is also the option of 1000 mile socks which in effect are a sock with a liner sewed into them with an aim to having the same end effect as having two pairs of socks.
The second is to get boots/trainers that fit. This sounds
glaringly obvious. And it is. Your boots must not be tight but at the same time
when they're tied not leave you sliding around inside them, as mentioned above
this movement leads to friction which will inevitably lead to blisters.
More to follow shortly on how to prepare your feet themselves when
looking at how to prevent blisters.
There's a good section on The Walking Site regarding footwear and socks in helping to prevent blisters.
Other "How to Prevent Blisters" posts
Intro on how to prevent blisters
The secret weapon in how to prevent blisters
Look after your feet to prevent blisters
How to prevent blisters on the day you walk
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