Ok... I was looking around the cr2 a little. The whole bottom part of the sandal is toe and the strap is the only part that is foot. They really aren't using any erc. There is a PBM for the foot and toe called GetaSandals, but it's not slaved to any of the rotation channels. The sandal works simply by bending the toe body part. There aren't any blocks so the sandal will go the other way to... meaning it will go right through the foot if the toes are bent down. The bend channel of the toes use a spherical falloff zone that contains the entire bottom part of the sandal so it will bend it as a single piece.