The Brooks Adrenaline GTS 21 presents a new wave of stability technology. The reliable trainer features a GuideRails? holistic support system to reduce the risk of pronation, and ease stress on core ligaments when in motion. Ensuring you are comfortable, and supported to perform your best, Brooks have upgraded the DNA LOFT cushioning to now extend throughout the forefoot. This cushioning protection allows for smoother transitions by delivering a highly responsive ride, and plush feel underfoot. The GTS 21 is your new, go-to trainer for those seeking high level support and cushioning on their next run.