Your adidas World Cup SG boots come with screw-in studs. Before your first use and periodically thereafter, ensure all studs are securely tightened into the TPU plate. Carry a stud wrench to adjust or replace studs as needed for optimal grip. These boots are designed *specifically* for very soft, natural grass pitches. Using them on harder surfaces (firm ground, artificial grass, indoor) will not only reduce performance and comfort but can also lead to premature wear of the studs and soleplate, and potentially cause injury. To maintain the quality and longevity of your K-leather boots: 1. Clean Immediately: After each use, remove mud and dirt with a soft brush or damp cloth. 2. Avoid Harsh Chemicals: Use only mild soap and water for cleaning. 3. Dry Naturally: Do not dry near direct heat sources (e.g., radiators, direct sunlight), as this can crack and stiffen the leather. Stuff with newspaper to absorb moisture and help retain shape. 4. Condition (Optional but Recommended): Periodically apply a leather conditioner specifically designed for football boots to keep the leather supple and prevent drying. 5. Store Properly: Keep boots in a cool, dry place, ideally with a boot tree to maintain shape.