Y3 M Running shorts in black Y 3 Mytheresa Y 3 Running Short Tights Gray Black Highsnobiety Shop Y3 M Running shorts in black Y 3 Mytheresa Adidas Y 3 Running Collection. Running leggings by Y 3. Y 3 applies its worldview to technical running apparel, and the result is the Y 3 Running Leggings. They hug the body with soft, stretch nylon and manage moisture with AEROREADY. Bonded seams create a smooth finish, and the elastic waistband features an adjustable drawcord. Tight fit Drawcord on bonded elastic waist 84% polyester (recycled), 16% elastane Imported Hydrophilic finish Bonded seams Reflective Y 3 logo