Puma Kids - Future Cat Crib (Infant) (New Team Red/White/Black) - Kids' Shoes: Let your little one speed around as he prepares for his future marathon. Suede synthetic upper. Removable midsole sockliner with GCS. Suede leather outsole. This formula 1 inspired crib shoe features elastic heel piece for easy step in. Soft materials makes this product a fantastic comfortable crib shoe. Each shoe comes with a removable insole that is marked, and meant to be taken out for easy measuring, to ensure a proper fit.