If this does not solve the problem, place some duct tape or moleskin over the area where a potential blister might develop.
If you start to get a blister or your feet are uncomfortable, it’s best to stop and take care of the situation before it becomes a real problem. Try a lightweight sock-liner in addition to heavier socks or wear two pairs of cotton sock to minimize friction. If this does not solve the problem, place some duct tape or moleskin over the area where a potential blister might develop.