The Cloudspike Amplius is part of the exclusive Prism Capsule collection — a limited edition spike designed for men competing in long-distance track runs. Built with Helion™ HF Hyperfoam, it delivers extreme energy return and springy cushioning, while a rigid Speedboard® at the midfoot ensures stability and powerful propulsion. The lightweight, one-piece upper hugs the foot for comfort, and the prism-inspired flare design makes a bold style statement. ⚡ Note: with a stack height of more than 20 mm, these spikes are not competition-legal under new World Athletics rules but remain perfect for training and personal performance.

Specs:

• Distance: Long-distance track events (on.com)

• Drop: 7 mm (on.com)

• Weight: Ultra-light (not specified, track-optimized)

• Midsole: Helion™ HF Hyperfoam (on.com)

• Speedboard®: Rigid for stability & propulsion (on.com)

• Upper: Lightweight, one-piece construction (on.com)

• Design: Prism-inspired flare aesthetics (on.com)

• Edition: Limited Edition

Key Features:

• Maximum stack height & extreme energy return

• Built for speed over long distances

• Helion™ HF Hyperfoam for springy cushioning

• Stable propulsion from rigid Speedboard®

• Unique prism design details