Sandals are an open type of outdoor footwear, consisting of a sole held to the wearer's foot by straps or thongs passing over the instep and around the ankle. While the distinction between sandals and other types of footwear can sometimes be blurry, the common understanding is that a sandal leaves most or all of the foot exposed. People may choose to wear sandals for several reasons, among them economy (sandals tend to require less material than shoes), comfort in warm weather, and as a fashion choice.