Gaiam Yoga Block - Supportive Latex-Free Eva Foam - Soft Non-Slip Surface with Beveled Edges for Yoga, Pilates, Meditation - Yoga Accessories for Stability, Balance, Deepen StretchesStability plus balance: Yoga blocks provide the stability and balance needed in your practice to help with optimal alignment, deeper poses and increased strength Durable supportive foam: These lightweight and supportive foam blocks are constructed of a durable foam with a nonslip surface and beveled edges for easy gripping. Premium blocks are 50 percent denser than standard EVA blocks Modify plus align: Use under your hands, feet or seat (meditation)