Under Armour Women's UA Speedform Gemini 2.1 Running Shoes Synthetic Rubber sole Innovative UA SpeedForm technology delivers an unprecedented precision fit for unrivaled comfort & zero distraction Smooth, ultrasonic welded seaming with Bemis tape for next-to-skin support & comfort Two-color, small holed mesh offers enhanced breathability Embedded sockliner within cavity of midsole for added cushioning, moisture wicking & seamless comfort ArchForm offers additional support & soft cushioning for an even better fit & feel