Inov8 Terrafly 343 Gore-Tex Trail Walking Boots 3 Arrow Midsole - The highest level cushioning, generally used for running and training, but it can also be used for long distance trail walking. Inov8 highest spec Sticky Rubber Compound - Exclusive sticky rubber compound which has been specially developed using climbing rubber technology. This rubber optimizes grip and traction in wet conditions. Meta Flex - Provides a natural forefoot flex, ideal for those tackling the toughest of trail walking Met Cradle - Designed to provide a secure foot hold, particularly imporant when on rougher terrains. Anatomical Last - This is based on the shape of the foot, this provides the most comfortable and relaxed fit.