Ibex Men's Arrivee Cycling Bib Short 87% Polyester/13% Spandex on seat and inner thigh 4-way stretch micro-fine polyester, anti-microbial, multi-dimensional Modified 9-panel construction 84% Merino Wool /11% Nylon / 6% Spandex on bottom; upper back and straps 100% wool mesh; 390 g/m2