Time and space. When you're in a different dimension, they don't matter at all. Open the door to extra-spatial speed in the adidas X Speedportal shoes. Children’s indoor shoes: The adidas X SPEEDPORTAL.3 IN J have a grippy rubber outsole to support speed on flat surfaces. The soft coated textile upper, the reinforcing smooth knit collar and the TPU footbed help maintain stability even during lightning-fast changes of direction.