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 the night. By day, the fluorescent yellow waterproof material helps to keep you clearly seen on the roads. 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.