Puma One 17.4 Firm Ground Football Boots – Black/Black/Silver – Kids The Puma One 17.4 Firm Ground Football Boot is a performance boot that closely follows the design direction of the PUMA ONE. The versatile boot’s synthetic upper material provides a light weight and durability, while the sock extension creates comfort and fit. Details: â¢ Synthetic upper material. Sock extension.â¢ TPU outsole with conical studs.â¢ Suitable for use on artificial grass and hard natural surfaces.â¢ Material Information: Upper: Synthetic upper material. â¢ Sock extension Mid Sole: EVA Outer Sole: TPU outsole.