Optimize your race-day performance with the tri-specific design and fast ride of the Ultra Race 4.0 + BOA from Zoot®. A high performance triathlon race day shoe. Light, breathable synthetic upper materials. UltraFit™ upper promotes a glove-like fit. Boa Dynamic Fit system allows for quick, precise adjustments. Z-Bound™ midsole supplies lightweight cushioning and energy rebound. Carbon Span+ provides tunable control that ensures a smooth, powerful toe-off for forward momentum without forefoot fatigue. Differential: 8 mm. ZCR outsole delivers traction and grip. Imported. Measurements: Weight: 7 oz.