Bontrager's RXXXL Bib Shorts are pro-level in form, fit and function. The main body is crafted from ultralight, soft, breathable and compressive fabric with extra compression in the lower legs for muscle support and superior aerodynamics. The 2-piece bib straps are super smooth for zero chafing and they sport mesh panels on the back and stomach for extra ventilation. For the ultimate in comfort, the RXXXL Bibs use premium Nosew seams in key areas and an Italian-made 3D chamois. The pad uses Airmesh foam that dries quickly, stretches in all directions and dissipates heat so long rides go by like they were nothing.