Women's BROOKSA(R) ADRENALINE GTS 20 TROPICAL :: Heated training deserves the jungle-inspired Women's Brooks Adrenaline GTS 20 Tropical running shoe. Sporting a modernized fit, you get the structured support you crave, without the bulk. Keep knee movement comfortably in check with the built-in GuideRailsA(R) support of your Adrenaline GTS 20 Tropical.