Nivia Powersmash tennis shoes on the court, you need a variety of skills to defeat your opponent; speed, agility, and tact come from within, but stability, grip, and support come from your shoes. The Powersmash is a non-marking indoor court shoe made for tennis and other fast-paced court sports. Spacer mesh upper TPU film with seamless upper design. The Fusion Technology construction produces an irritation-free fit, reducing bulk, layers, and weight Two layers of high-density foam line the collar and mould to the athlete's foot to create a personalised heel fit, adding soft support and custom comfort.