Asics - Gel-TRX (Black/Liquid Silver/Red) - Men's: The GEL-TRX(R) is the most cardio-centric training shoe, featuring maximum visible, rearfoot GEL(R) System. Visible GEL® Cushioning System for maximum rearfoot shock attenuation. Full length spEVA(R) Midsole material providing increased shock attenuation and midsole durability. Trusstic System(R) links the rearfoot and forefoot and shores the midfoot.