The Brooks Adrenaline will see an update in 2013. A go-to trainer for thousands of runners, the Brooks Adrenaline provides the perfect mix of stability and cushioning for daily training. Look for a similar feel to the Adrenaline GTS 12 as the successful midsole will remain unchanged. Improvements can be found in the outsole with the addition of Brooks Omega Flex Grooves. This outsole design improves flexibility and increased gait efficiency. Minor changes to the upper include 3 elastic eyelets on the lateral side and redesigned placement of elastic eyelets on the medial side. These updates allow for a snug glove like fit across the middle of the foot. The Brooks Adrenaline GTS 13 will arrive at your local running shop in January 2013 and retail for $110.