Features of the Pearl Izumi Men's ELITE Road v5 Shoe 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 Bi-directional Closure wraps the foot for a semi-custom Fit and secure foot retention Boa IP1 reels allow 1mm micro-adjustability and pop up for full release 1:1 Integrated Carbon Power Plate delivers feather-light stiffness (stiffness rating of 13) Replaceable heel bumper