These shorts have two layers. The functional inner layer made of a bi-elastic material fits snugly against the body. This fabric is fully breathable. It absorbs and transports moisture to the outside. This helps you maintain a comfortable body temperature while moving. The stylish outer layer is our unique laser cut mesh fabric. The shorts have a string for a comfortable fit. Those shorts have two layers. The functional inner layer is made of a four-way stretch material and is tight to the body. This fabric is fully breathable. It absorbs and evaporates moisture which helps you to maintain a comfortable body temperature during running. The stylish outer layer is made of our unique laser-cut grid fabric. These shorts come with a size adjusting cord to maintain a comfortable fit.