Asics Gel-1130 Mules. The GEL-1130™ MULE sneaker converts the ninth iteration of the GEL-1000™ series into an open heel design, making it easy to slide on and off. Its traditional materials have been repurposed to evolve the retro runner with a more modern look. Still maintaining a supportive fit, this shoe's mule-specific functionality helps promote a smoother foot entry. Additionally, this retro runner’s comfort is remixed for extended periods of standing and walking. Shock-attenuating material placed in the midsole of the shoe for cushioning and shock absorption. Open heel design makes it easy to slide on and off. Imported.