Mid-Cut Shoes For Training. The Nano, amplified. You never know what challenges the WOD will bring. With these Reebok Nano X Unknown men's mid-cut training shoes in Pure Grey you'll be ready. The textile upper and high collar provide extra coverage and support. Added midsole cushioning and a decoupled outsole make them more comfortable than ever before. Textile upper and EVA midsole for lightweight cushioning. Rubber outsole provides traction and durability.