Sugoi Men's RS Tri Shorts 80% Nylon, 20% Spandex Made in the USA or Imported Panel-specific design dictates the function of fabric in each area: aerodynamics, breathability, and durability are all addressed making the RS Tri Short a class leader in performance Ultra Aero fabric on outer thighs for maximum aero efficiency Incorporates Sugoi's industry leading RS short technology Low profile leg band with silicone printed inner tape locks the short in place while eliminating leg constriction Engineered fabric on front panels for increased breathability