The Infinity is made of ultimate stretch canvas that gives a streamlined fit that highlights the contours of the foot while being incredibly comfortable. It has an upper like a ballet flat but in with a soft thing elastic binding (with no drawstring) that contours to the foot in a full range of movement. The elastic binding is ideal for floor work where the top of the foot is in contact with the floor, eliminating bruising from pressure where the drawstring is knotted. The elastic also evenly distributes tension around the foot relieving pressure on the Achilles tendon.
Bloch recommends choosing two sizes down from your women's street shoe size. For Tween/youth they recommend choosing the same size as your street shoe size.