Pearl iZUMi Men's Tri Fly IV Cycling Shoe 100% Synthetic and mesh Synthetic sole 1:1 Anatomic TRI Closure: Eliminates hot spots and removes pressure from your instep Fully lined mesh upper for bare foot comfort Select 1:1 Power Plate: Select Grade Nylon and Composite Fiber plate for lightweight stiffness and durability Direct-Vent technology for cooling and drainage Concave shaping for ultra low 7 mm stack height, enhanced plate stiffness and anatomic support