K-SWISS Men's K-Ona C Running Shoe 100% Synthetic and mesh Rubber sole Super Foam - An energy-return foam that resists compression lasting longer to provide cushioning and comfort. Guideglide - Midsole construction that centers the foot from heel-to-toe ensuring a comfortable and stable ride. EVA - This maximizes cushioning and enhances durability of the midsole provided by special formula EVA. Flow Cool System - Increases breathability and moisture management to keep feet cool and dry. Drainage System - Moisture is removed from the shoe, using a moisture transportation system.