MID- TO LONG-DISTANCE RUNNING SHOES MADE IN PART WITH RECYCLED MATERIALS.The Boston Marathon is a race. But it's also a goal and a training plan during all the days it stays on your mind before the big one. The Adizero Boston 11 Shoes are built for mid- to long-distance running. They bring a race-day quality to training, with a propulsive feel that comes from ENERGYRODS, which limit energy loss underfoot. They're fast, but that does not come at the cost of durability — the midsole mixes ultra-light Lightstrike Pro cushioning with durable Lightstrike EVA.,Regular fitLace closureLightweight mesh upperFlexible feel with support in key areasENERGYRODS limit energy lossLightstrike Pro cushioningMidsole drop: 8.5 mm (heel: 39.5 mm / forefoot: 31 mm)Continental™ Rubber outsoleUpper contains a minimum of 50% recycled contentProduct color: Grey Three / Zero Metalic / Carbon