Merrell Chameleon Wrap Slam Trail Walking Shoes - SS17 Rubber Breathable Mesh Upper - A highly breathable upper also built with synthetic upper for greater durability. Injection Moulded TPU Instep Stability Arm - Designed for extra support and stability. Protective Moulded Rubber Rand - Provides good protection in mountaineering conditions. Protective Moulded Rubber Toe Bumper - Offers protection for your feet from debris and stones. Lycra/Neoprene 4-Way Stretch Collar - For padded comfort around your foot.