Adidas Adizero Boston 4 Running Shoes Rubber sole ** UPDATED ** Redesigned Upper - A complete revamp of the visual image of the footwear, resulting in a new and very sleek, low-profile image. Air Mesh Upper - Gives your feet maximum breathability and helps to reduce overall weight adiPRENE+ - In the forefoot maintains propulsion and efficiency. Torsion System - For midfoot integrity, ensuring independant movement of the rear and fore foot whilst still maintaining stability adiWEAR Outsole - For maximum durability in high wear areas as well as for perfect grip and lightweight durability.