Track and field spikes for both track and sand Color: Orange The upper is reinforced with synthetic leather to improve breathability and enhance hold. SPEVAFOAM, which has excellent resilience, is equipped on the entire midsole, and SOLYTE, a lightweight material, is used in the heel. The outsole, which uses a plate with increased flexibility and a durable rubber material for the heel, allows for the replacement of pins and attachments according to the track conditions. I used it 2 or 3 times, but I am selling it because the size didn't fit.