For long distance runners, these Boost tech shoes are designed to return energy so there's a little pick-up left in your feet for the final 5k. Small capsules in the midsole foam provide energy return as your foot strikes and releases the ground. They don't feel soft, but quick, bouncy and fun. Primeknit material expands with your foot to helps reduce irritation, while the Sockfit upper provides a snug, supportive fit. Dual torsion midfoot smoothes transitions from midfoot to forefoot push-off. Boost midsole stays soft and bouncy for higher energy return than any other running foam, and retains cushioning across a wide temperature range. Outsoles are Continental rubber for sure-footed traction even on wet pavement.