The CanDo® 2-Layer Round Foam Roller features a premium 2-layer design with a dense core and a unique outer layer that comes in different firmness levels. The total diameter is 6″ with a 4″ high-density core and a 1″ outer comfort and firmness layer that wraps around the core. Outer layer is available in 3 levels and is color-coded to indicate firmness. The roller can be used for rehab exercises for upper/lower back, calf, hamstring, gluts and more. It is designed for Pilates, core, abdominal, back stabilization and strengthening routines.