The Boston Marathon is a race But it39s 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 longdistance running They bring a raceday quality to training with a propulsive feel that comes from ENERGYRODS which limit energy loss underfoot They39re fast but that does not come at the cost of durability the midsole mixes ultralight Lightstrike Pro cushioning with durable Lightstrike EVARegular fitLace closureLightweight mesh upperFlexible feel with support in key areasENERGYRODS limit energy lossLightstrike Pro cushioningWeight 96 ounces size 9Midsole drop 85 mm heel 395 mm forefoot 31 mmContinental Rubber outsoleUpper contains a minimum of 50 recycled content