Bio Barracuda slipper made of dark gray recycled felt. Anatomic sole made of soft cork. Rubber sole with waves made with natural colored recycled cork shavings. Upper material: felt Lining: felt Sole: TR and recycled cork This item is #animalfree Suitable for vegans * Approved by PETA vegans. The insole we use to make Barracuda is anatomic, being a little softer than other types of footwear. If you hesitate between two sizes, we recommend that you choose the smaller one.