On Running CloudMonster Trainers deliver a new dimension of cushioning for hard-surface training. CloudTec® with Helion™ foam and a Speedboard™-driven rocker sole maximize shock absorption and forward propulsion. Key attributes: Multicolor | Maximum cushioning | High shock absorption | Engineered for hard-surface training | Responsive energy return | CloudTec® cushioning that activates on landing | Helion™ foam midsole layer | Speedboard™ insert for propulsion | Rocker-shaped sole for a dynamic stride | Patented sole design | MONSTER-version cushioning geometry