ASICS Men's Gel-Solution Lyte 3 Tennis Shoe 100% Synthetic Imported Rubber sole Trusstic system technology: reduces the weight of the sole unit while retaining the structural integrity of the shoe. Pguard toe protector: enhanced toe durability. P.h.f (personal heel fit)collar lining: 2 layers of memory foam line the collar and mold to the athlete's heel, creating a personalized fit.