Many conventional ballerinas have more than one pair of dance shoes. These include dance slippers and pionte shoes which are manufactured with a special toe box to accomodate the often difficult pointe work that ballet dancers have to do. Standard colors of ballet dancing shoes are pink, white and black. The distinguishing charecteristics of pointe shoes are the sole and the shank. The special insole or shank as it is called, can be made from many materials such as leather, cardstock, burlap or plastic of varying lengths and thickness. Some dancers keep more than one type and they are used for performing different styles. The sole is usually made from leather and is sewn into the surrounding material. It is on the bottom and well hidden and accentuates the dancers foot. The shoes are secured to the foot by tying silk ribbons, drawstrings or elasticised bands around the ankle They sometimes have ribbons or elastic bands that you purchase separately and sew them on yourself. Some ballet shoes have split soles for additional flexibility. There are ballet dance slippers that are designed for working in a studio and on a softer floor. These lighter ballet dance shoes are made from canvas or suede leather, and have split soles for better flexibility and a more tactile feel. When pointe work is not required, dancers will wear these shoes for practise. The uppers of the shoe are sometimes dyed to the same color as the costume. Because of the way they are made, ballet dance shoes are sized differently to conventional shoes. Different manufacturers may also have slight differences between each other. They are designed to be a snug fit on the foot without rubbing or hindering the circulation.