Alpinestars - A-0 Roost Base LayerFeatures Protective base layer with strategically placed padded zones on the shoulder, biceps and chest area, to provide additional protection against tire roost, gravel and small stones Compatible with all Alpinestars roost guards and chest protectors Knitted construction chassis is lightweight, breathable and provides a comfortable tight fit while being stretchable enough so as not to limit any rider movements Knitted construction requires less