Lace up for that finish line-feeling with the Boston Edition Endorphin Speed 4 Grab your one-way ticket to a high performance run that pays tribute to the incredible city with the Boston Edition Endorphin Speed 4. The red, white, navy and gold colors bring the race day-ready model to life with the help of a pine tree emblem on the heel, representing the region’s unique natural offerings. So whatever your run throws at you, show your love for the iconic marathon city with the Boston Edition Endorphin Speed 4.