Under Armour UA Toxic Six Women's Running Shoes Molded Neoprene Upper - Ultra lightweight upper, which allows your foot to move naturally. MPZ - Protective contact pads, positioned at key points to help absorb impact without sacrificing compression support. Offset Laces - Designed to reduce pressure and pain on top of the foot. Perforated Heel and Toe Detail - Provides enhanced breathability. Super-low and Flexible Micro G Midsole - built into the heel and forefoot allowing you to feel the road while still providing cushion, grip and speed.