Merrell Agility Synthesis Flex Trail Running Shoes Grey Red ( 11.5 men) Merrell Agility Synthesis Flex low top trail running shoe in grey and red. Grey mesh upper with black grid pattern overlays. Red lace loops and accents, grey laces. Grey midsole with a red and grey rubber outsole, circular lug pattern. Merrell branding on the heel and tongue. Minor yellowing on the toe box mesh. Slight wear on the outsole treads. No major damage. Size: 8.5 men