A ballet shoe, or ballet slipper, is a lightweight shoe designed specifically for ballet dancing. It may be made from soft leather, canvas, or satin, and has flexible, thin soles. Traditionally, women wear pink shoes and men wear white or black shoes. Tan colored slipperswhich are unobtrusive and thus give the appearance of dancing barefootare worn in modern ballets and sometimes modern dancing by both men and women. All ballet dancers wear soft ballet slippers for the main part of the ballet class. More advanced female dancers may change into pointe shoes for centre work and performance. Ballet shoes must fit very closely to the foot, for safety and to retain maximum flexibility. Ballet shoes traditionally have a leather sole which does not reach all the way to the edges of the shoe. A modern development is the split sole, which provides greater flexibility. They are usually made from soft leather, canvas or satin. Leather shoes are long-lasting.