Eco-certified EVA foam, SGS passed - 100% raw material, EVA foam Unique design with dimpled surface for deeper massage to relieve muscular pain and tightness similar to the thumbs of a massage therapist Stretches muscles and other soft tissues in multiple directions, breaking down "knots" to help increase your flexibility and help relieve back pain

Compact enough to travel with Outside : 100% EVA, Inner : 100 % EVA