adidas Drehkraft Weightlifting Shoes Boa Closure System - Provides a precise, secure fit with swift adjustment when needed. Synthetic Upper - Delivers a lightweight upper with traditional weightlifting properties. Die-cut Midsole - Weightlifting engineered, high-density for lightweight stability. Heel Support Design - For an integral rearfoot with superb lightweight stability Welded 3-Stripes - Flexible, for lightweight, durable support.