The focus of the Course Superleggera Jersey was to merge superlight with super breathable. At the chest, 1001 Mesh is used to create a layer of air, wick moisture, and keep you dry in warmer conditions. The main body is coldblackR Mondo which reflects heat but also has a unique ability to stretch and recover its shape providing a perfect aerodynamic next to skin fit. Wide Signature silicone gripper at back hem: Maintains place and fit. Aero Lazer band at arm: Lazer cut, flat, smooth transition for improved aerodynamics and muscle support. Stretch trim: Provides a good fit. Front and back reflective accents: Enhance visibility. Men's Next to skin fit. UPFSPF 50. coldblack finish.