Ryka Women's Synergy low profile trainer shoes feature a synthetic, leather, mesh and high density foam upper. Fully functional strap creates a personalized fit and ensures proper foot impact alignment. C2™ cartridge highly innovative cushioning system with active spheres that provide spring-like qualities. N-Gage™ high grade EVA foam and premium rubber combine to create super lightweight cushioning and rebound system. S.G.S. (Skeletal Guidance Shank) provide mid-foot support during heel-to-toe transition acting as a center frame stabilizer. Ortholite® breathable insole provides durabilty, comfort and fights odor.