CanDo Foam Roller Black Compos Extra Firm Round 6 x 12 Safety Pins You can set the target Wall Transformers You can set the target zone for your training as beats per minute (bpm) as a percentage of your maximum heart rate or as a percentage of your heart rate reserve (HRR%) * Polar Fitness Test: Polar Fitness Test measures your aerobic fitness at rest in just five minutes Two way stretch top enables the cushion cells to conform to the individual's body shape without diminishing product effectiveness or therapeutic value * The cover has a two way 100% Polyester top material that is a durable heavyweight fabric with a soft feel * The side material is composed of a 3 layered knit spacer fabric which provides superior air circulation that ventilates and cools the user * The fluid proof solid non skid base material offers a durable easy to clean surface * The cover has the added feature of Velcro© straps placed on the bottom to allow the user to attach the cushion to their chair * Encased foam is stitched to the cover for added comfort around the leg trough areas * Cover is machine washable * Weight: 1 The molded composite foam rollers are more firm than the polyethylene roller and are rugged * Weight: 1