These foam blocks are made from a lightweight EVA foam. They are strong and firm enough to support your body weight, but have a soft texture that allows a little "give" and makes them comfortable to grip. Their beveled edges add comfort, so there will be no sharp edges pressing into your body. Yoga blocks (also known as yoga bricks) offer three heights to provide support and stability during your practice. Your flexibility may be different in various poses, or you may find your flexibility and strength will improve allowing you to move the block from its upright position to flat over time. This yoga prop can also be used to intensify a stretch, such as when you place it under your hips or back to increase an arch. Use in Iyengar, Hatha, Anusara, Ashtanga, Power Yoga, Restorative and Pre-Natal yoga practices. Don"t do yoga? Use these blocks to extend deeper into a pushup, or challenge yourself with a less stable base, or add to your stretching routine.