The newest edition of Brooks best-selling neutral shoe provides excellent cushioning and allows your foot to move naturally and in total control Features anatomical Brooks DNA for customized cushioning and Omega flex grooves for extra flexibility Brooks BioMogo - the first-ever biodegradable running shoe midsole; our non-toxic, natural additive to the midsole enables it to biodegrade 50x faster than other midsoles without changing the performance or useful life of the shoe. Caterpillar Crash Pad - customizes your laydown with just the right amount of cushion and stabilization for a smooth heel to toe transition. HPR Plus Outsole - higher durability, abrasion-resistant rubber outsole compound that extends the life of the tread