The Proviz switch jacket is a dual-layer, reversible garment that can be worn either way to give cyclists two options, one for day and one for night. By day and depending which color you choose (yellow or black model) you have great flexibility. When riding in the dark, you simply switch the jacket round to enable the reflective material to reflect back artificial light from street and vehicle lights in order for your position to be more clearly identified on the roads. It also has a perforated back to aid with making the jacket as breathable as possible. Two side pockets and two separate side vents help to keep the air flowing between the layers. About the fabrics: the fabrics used for the switch range were chosen specifically to make the switch cycling jacket extremely versatile. The reflective material used is the same as the highly popular REFLECT360 range and it is certified to made clear layering 20471 standard.