In-Shoe Comfort: Dual density 1:1(R) footbed is ergonomically designed to provide optimal support, pedaling efficiency, and comfort Perforated synthetic leather upper is durable and breathable BOA(R) Fit System with dual L6C dials for zonal fit adjustments Soft TX lace guides eliminate pressure and hotspots Durability and Traction: 1:1(R) PRO Carbon Power Plate drops weight and adds extra ventilation without sacrificing stiffness EVA foam and rubber heel bumper gives stability and walking comfort 252 grams per shoe (size 42)