A foldable foam roller has all the same benefits as a regular foam roller: it will help relieve knots in your muscles and it will help you warm up the muscles for your workout. It is a great tool for working on your mobility. The Foldable Foam Roller folds into a compact cylinder, just 15 cm high. This way it takes up less room in your gym bag or suitcase. When extended it is 35 cm long.