Gaiam's Yoga Essentials Yoga Blocks are lightweight and provide the stability needed for optimal alignment, deeper poses and increased strength. Used under hands, feet or your seat, Gaiam's lightweight block ensures proper alignment and safely assists in deepening stretches. If you feel tight, don't risk injury - grab a block and enjoy your yoga session. Constructed of a durable foam with a nonslip surface, available in several colors and measuring 9-Inch L x 6-Inch W x 4-Inch H and weighing 1.5lbs. Support your Stretch Safely support and modify poses to suit your level of flexibility. Gaiam's Yoga Essentials Yoga Block helps you achieve the full benefits of each yoga pose by providing extra height, stability and support. It gives you the support needed to hold postures longer and with more control, while this stylish tool also assists with proper alignment which enhances confidence during practice.