Designed to create pressure that releases trigger points and loosens knots in muscles and improve overall flexibility， especially in commonly tight areas such as the back， calves， IT band， hamstrings， lats， and glutesHigh density foam structure provides a deeper massage than standard foam rollers， and is firm enough to support all body types without losing shape after regular useProvides an unstable yet dense surface that makes it a versatile fitness tool for Pilates core work， rehab exercises， spine stabilization， balance work， and body-awarenessEases tightness in muscles after high intensity training for faster recovery and reduced soreness - a great addition to workout programs for both beginners and advanced usersMade out of non-toxic， high-density expanded polypropylene (EPP) that is easy to clean.