adidas ISS US National Lab x UltraBoost 20 - Grey/Blue - Size UK 9

The UltraBoost 20 is designed for high performance and offers excellent cushioning and support, making it suitable for many types of training and running. For elite professional competition, specific sport-focused footwear might offer marginal advantages in weight or design.

Gently wipe the Boost midsole with a damp cloth. For tougher marks, use a soft brush with a small amount of mild soap and cold water, then wipe clean with a damp cloth. Avoid harsh chemicals or abrasive cleaning tools.

The collaboration signifies that these shoes were developed with input and testing considerations inspired by space exploration, implying a focus on advanced materials, durable construction, and high-performance engineering.

It is not recommended to machine wash the UltraBoost 20. Hand washing the Primeknit upper and wiping down the sole is the safest method to preserve the shoe's integrity and appearance.

Generally, adidas sizing is consistent. However, due to the nature of the Primeknit upper, some users find they prefer a half-size up or down for a perfect fit. It's always best to consult a size guide or try them on if possible.

The primary benefit of the Boost midsole is its exceptional energy return and responsive cushioning, providing a comfortable and energetic feel with every step.

No, the Primeknit upper is breathable and not waterproof. They are designed for athletic performance and comfort, not for protection against heavy rain or submersion in water.

The Primeknit upper is designed to stretch and mold to your foot. Wear them around the house for short periods to break them in. Ensure you have the correct size; consider trying a half-size up if persistent discomfort occurs.

Ensure the Boost midsole is clean. Small debris can sometimes affect the feel. Consistent use will naturally affect the material's properties, but regular cleaning can help maintain performance.

While the rubber outsole offers good grip, wet surfaces inherently reduce traction. Ensure the outsole is clean and free from debris. Exercise caution on very slick surfaces.

The iridescent finish is part of the design. Avoid prolonged contact with materials that could potentially pick up color, especially when wet. Clean gently if minor transfer occurs.