Spalding TF-SB1 NFHS Official Size Football - Men's Stretch the defense with the Spalding TF-SB1 NFHS Official Size Football. This NFHS approved ball offers the durability and feel of a Top Grain Horween S-Tack leather cover. Spiral Balance Technology creates a tighter and more accurate spiral. Blue Mountain threat and the DCW (Diamond Cross Weave) lacing system ensure a long-lasting tough ball that will go every down. The 4-ply bladder and 2-ply water resistant liner keep sustain the shape of the ball.