supernatural agility. the nike jr. hypervenom phelon kids' firm-ground football boot is built for unrivaled agility on firm, natural surfaces with a glove-like fit. an innovative traction pattern only places studs where they're needed for faster release and maximum responsiveness.. benefits. soft, thin synthetic leather upper for a great fit and ball feel. contoured last mirrors the shape of the foot for a glove-like fit. agility traction pattern for shorter release times and enhanced responsiveness. shortened lace area to increase the size of the vamp and strike zone. firm-ground (fg) studs for use on short-grass fields that may be slightly wet but rarely muddy. product details. full-length tpu plate for a supportive, responsive feel. round forefoot studs for multidirectional traction. toe and midfoot blades for enhanced toe-off traction. contoured sockliner with textile top layer for soft, supportive cushioning.