Regulating your temperature is key to performance, and a good base layer is key to regulating temperature in cooler/cold weather. The Louis Garneau SF-2 Plastron Base Layer is lightweight, but ultra effective. The Supra Filo 2 mesh creates a barrier where moisture escapes and regulated air stays next to your skin allowing you to layer up for the cold without soaking yourself into clamminess.
Ultra light, thin layer is non-constricting and super effective
Supra Filo 2 Mesh is the ultimate moisture control
Base layer insulates body temperature next to skin without overheating