Aimed at competitive triathletes looking for maximum response, the new Tri Fly Elite v6 shoe features an upper built for sockless comfort and lighting-quick transitions, and a sole focused on energy maximizing efficiency, this shoe makes every effort count1to1 Anatomic Tri Closure eliminates hot spots and removes pressure from your forefoot (patent pending),Unibody construction eliminates traditional lasting board to deliver super low 5mm stack height for maximum pedaling efficiency,Advanced 3-Layer Seamless Composite Upper offers exceptional breathability and eliminates hot spots by adapting to your unique foot shape,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,1to1 Integrated Carbon Power Plate delivers feather-light stiffness,Stiffness Index: 13/13,SPD-SL compatible,Weight: 255gr (Men's size 43 EUR).