Tech Specs Surround wrapping upper structure reduces overlap and provides a glove-like fit. Rider-tunable spikes allow riders to select and swap spikes to match riding styles and conditions. Ultra-rigid, lightweight carbon fiber reinforced midsole. Supple high-density synthetic leather with perforation and lightweight mesh/TPU combination bring superior fit and comfort. Dual independent BOA L6 dials allow quick, micro tension adjustments. Adjustable powerzone lace guide securely holds forefoot.