Pearl Izumi Tri Fly Pro v3 Cycling Shoe 100% Textile/Synthetic Imported Synthetic sole Spring/summer 2017 Unibody construction eliminates traditional lasting board to deliver super low 5mm stack height for maximum pedaling efficiency 1:1 integrated carbon power plate delivers feather-light stiffness (stiffness rating of 13), dual density eva insole provides excellent longitudinal and transverse arch support Oversized heel pull offers easy on/off performance during critical transition times, replaceable heel bumper 3-bolt road cleat