The Stand21 Featherlite Series FHR Device is the lightest device currently available. It is made from ultra high strength carbon composites that provide the highest levels of safety at the incredibly low weight of only 310 grams (bare). The device features a new and more ergonomic leg design and also a new revolutionary strap passage. The device is currently being used by the worlds top racing drivers including Lewis Hamilton.It has a revolutionary strap passage design that passes through the device. The rear is flat so there are no obstructions that would normally cause discomfort between the device and your race seatUltra lightweight design will make you feel like you are not wearing a device on at allAvailable in the following angles20º recline suitable for most saloons, GT s and rally cars or other applications with more upright seating positions30º recline suitable for most single seater, formula cars and sports prototypesand sizesMedium: Neck circumference between 38 and 45.5 cm