Features of the Pearl Izumi Women's Tri Fly ELITE v6 Shoe 1:1 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 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