To determine your arch type, you can perform the "wet test." Wet your feet and step onto a flat surface, like a piece of paper or a dry floor. Observe the shape of your footprint - if it's flat with little to no curve, you have low arches; if there's a noticeable curve, you have medium arches; and if only the heel and ball of your foot leave a mark, you have high arches. Knowing your arch type will help you find the right arch support sandals for your needs.