Geox U Nebula Mens Trainer Nebula was made to travel the world. Wearing them is like walking on a cloud & just like a cloud Nebula knows no limits. It is the perfect shoe for people who love to travel in comfort, without having to give up their individuality & style. Fastening: Elasticated Material Composition: Leather+ Textile+ Other/ Textile+ Other/ Other Textile + Leather. Nebula. Extra Breathable & Lightweight. Durable. Practical. 3D Inner Breathing System.