Nike Alpha Shark 3/4 - Boys' Grade School The most aggressive Shark yet, the Nike Alpha Shark 3/4 will have players all over the field amping up their speed. To avoid being left behind, lace up this lightweight, synthetic leather cleat. It provides extra support with an asymmetrical performance collar. The ankle collar helps hold the foot comfortably in place over a full-length Phylon™ midsole, designed for responsive comfort. Nike's fast-flex last brings natural flexibility under the foot, while holding Shark rubber studs for intense traction. Wt. 9.3 oz.