Designed to keep you seen while being comfortable, the Nathan Nightfall Visibility Vest provides you with safety and visibility. With 360 degree reflective details and a visibility of up to 1,200 ft, it can be used running early in the morning or at dusk to keep you visible when you need it. Fit & Design: High visibility vest offers visibility up to 1,200 ft Made of soft, durable, breathable mesh so you don't overheat Provides you with 360 degree reflectivity so you can run safely Includes retro-reflective details that reflect light directly back to its source for increased visibility Included a hidden key pocket to keep your keys safe while on the move Vest has attachment points for L.E.D. lights (not included) Included waterproof ID/medical emergency card Adjustable fit for use over multiple layers One size fits most