One size fits all, designed with adjustable straps for easy fit and great stability. 500ml soft flask included. Well suited to city runs, a secure zipped pocket keeps your phone, keys, and credit card safe. The mesh elastic construction combined with the soft adjustable strap provides a comfortable and snug fit. For right, left, large and small hands. The 500ml soft flask rests in your hand and collapses as you drink so there’s no sloshing around while you run.