Sugoi Men's RS Zero Bib Shorts body : 88% Polyester, 12% Spandex / inner waistband : 84% Polyester, 16% Spandex Imported Formula FX chamois Midzero body offers excellent thermal regulation featuring excellent stretch and recovery Built off the same dimensions and profile as our award winning RS shorts Gripper elastic leg opening keeps leg warmers securely in place Formula FX chamois