Men's BROOKSA(R) ADRENALINE GTS 20 TROPICAL :: Add tropical punch to your day in the stylish Men'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.