Under Armour Women's UA SpeedForm Apollo GR Running Shoe Synthetic Smooth, ultrasonic welded seaming with Bemis tape for next-to-skin support & comfort Perforated toe with ultrasonic seal for durable breathability Full-length Micro G midsole creates an incredibly lightweight & responsive ride TPU shank at midfoot for extra support & stability Full-length 4D Foam sock liner conforms to your foot's exact shape, eliminating slippage