A Wet Test is basically an easier way to determine your size when picking out shoes. Simply wet your foot, step on a piece of brown paper, and trace the outline of the impression your foot left. If the imprint shows most of your foot, you know you have low arches. If only the edges and the ends of your feet show in the imprint, it may be a sign that you have high arches. Use this information to your advantage. Another good idea is to remove the insole from your old shoes and match the wear of the insole to the size of shoe you require.