If you buy quality white flats, it'll cut down on the chances of blisters. However, if your feet are prone to sweating and blistering, limit your time in your flats. For instance, if your feet easily blister, these aren't the shoes you want to wear for a long day out.  Preserve them for workdays when you're sitting down for several hours. There are remedies that you can try, like covering blister-prone areas with band-aids. But sometimes that's not foolproof. If you want to avoid issues with your feet, try not to stay in flats for too long—especially if you have sweaty feet.