The Salomon Sonic Ra Pro is the lighter and faster shoe in the SONIC RA story. The Sonic Ra Pro is noticeably more cushioned than any other lightweight racing shoe we stock, which suggests they will double up nicely as a regular running / training shoe. At 235 grams the Salomon Sonic Ra Pro feels responsive and capable of shaving time from your PB. The fit is comfortable and has an emphasis on a close and responsive connection to your foot. Sonic Ra Pro has a VIBE cushioning heel insert that softens the impact but allows for a powerful push off.