These Yoga blocks provide the stability and balance needed in your practice to help with optimal alignment, deeper poses and increased strength. These lightweight and supportive foam blocks are constructed of a durable foam with a nonslip surface and beveled edges for easy gripping. They are 50% denser than standard EVA blocks. Use under your hands, feet or seat for meditation to ensure the proper alignment needed in order to safely support and modify poses to suit your level of flexibility If you feel tight, don't risk injury and grab a block or two