Merrell Agility Peak 4 Women's Trail Running Shoes This cushioned, grippy trail runner is designed for those who want a lot of protection on even the most rugged trails. Version 4 was updated with a slightly thicker midsole made of the lighter-weight FloatPro foam and a new Vibram Megagrip outsole for even better grip on rock. Jacquard Mesh Upper Designed to provide comfort and protection, the Merrell Agility Peak 4 Trail Running Shoes have been constructed using a jacquard mesh upper. The jacquard upper works to provide lightweight breathability and protection to keep your feet safe on rocky terrains. Acting as a lightweight second skin the mesh ensures you are able to go the distance in complete comfort. Perforations in the fabric encourage cool air to circulate, removing uncomfortable heat build-up to create a healthy environment for your foot to thrive in. As well as this, the breathable mesh lining sits comfortably against the skin and further enhances breathability. The pad.