Adidas Childrens Kids Firebird Tracksuit Bottoms. Unleash their inner athlete with the Adidas Children´s Firebird Tracksuit Bottoms, a timeless piece for young champions in the making. Crafted from 100% recycled polyester, these bottoms feature iconic contrast stripes, an embroidered Trefoil logo, and practical side zip pockets. With an elasticated drawstring waist, they promise a regular fit for comfortable, unrestricted play. Ref: UTGT67801