Comfortable clothing and sturdy, soft soled shoes are essential for travel in Bhutan. Warm clothing is recommended. Except for the summer months, down jackets and woollen sweaters are suggested. In summer, heavy cottons and lightweight woollens will be acceptable. Altitude differences account for a wide range of temperatures from day to night, year round so the layered approach to dressing is the best method. While visiting temples and other religious institutions, dress modestly and respectfully. Slacks are more appropriate for men and long skirts for women. Shoulders must also be covered when inside religious buildings. Also refrain from smoking while on the premises. Please keep in mind that shoes must be removed when entering temples.