Louis Garneau Men's Tri Course Sleeveless Top Lycra^Mesh^Nylon^Polyester^Spandex Made in USA CB SpeedTech Fabric: One of the most aerodynamic fabrics developed. Made of dimpled mesh construction, this fabric is light, breathable and chlorine-resistant. CB M-2 Fabric: Developed in cooperation with the Canadian Cycling team, this fabric is the most aerodynamic you can get. Full length zip with inner flap 2 floating rear pockets with flap to reduce tension Tri-specific seam placement for optimal comfort on swim, bike and run