Boot with low-profile sole and recycled TPU bubbles Alien Barefoot fits small. It is recommended to choose a size up. Upper: 70% PA + 30% Recycled PU Sole: 100% Rubber SIZING CHART Please note that due to Brexit, additional charges will be applied for orders shipped to the UK. The amount varies based on the price of the item, up to 30% of the total value. The amount for orders shipped to China varies based on the price of the item, up to 20% of the total value.