Asics Trail Tambora 2 Running Shoes Rearfoot GEL Cushioning - Attenuates shock during impact and toe-off phases and allows movement in multiple planes as the foot transitions through the gait cycle. Trusstic Rubber System - a light-weight moulded component which links the rearfoot and forefoot and shores the midfoot as it prepares for propulsion. Trail Specific Outsole - Reversed lugs provide uphill and downhill traction on all types of terrain. AHAR - Acronym for ASICS High Abrasion Resistance Rubber. Placed in critical areas of the outsole for exceptional durability. Reflective Detail - Reflective stripes on the shoe to help you visible in low light conditions.