Nike Court Tech Challenge 20 Lava Tennis Shoes 2020 Men's Size 11.5 Challenge 20 puts a modern spin on an iconic court shoe. You'll get the same vibrant graphics found on the original design with the added comfort of modern materials. Original Style Synthetic leather and vibrant graphics mimic the design of the original Nike Air Tech Challenge 2. "Nike Air" is printed on the heel. Soft Cushioning A visible Max Air unit in the heel cushions each step. Men's size 11.5 These shoes are not in the best condition, they need to be cleaned and there are a few imperfections. Soles still have some life. No smoking home.