The Adrenaline GTS 6 is ideal for runners with normal arches looking for a stable, responsive ride. Runner's World magazine awarded Brooks' Adrenaline GTS 6 "Best Update" in the leading running magazine's Fall 2005 Shoe Guide. Features progressive posting for ultra-smooth transitions through the gait cycle. Features an internal support saddle and external heel Stabilizer. Heel and forefoot Hydro Flow.