Manduka Yoga & Exercise Blocks Slip resistant finish, a soft and comfortable hand, firm support, radius edges, strength and durability Over 50% recycled material in every block provides a higher level of recycled material than any other recycled foam block currently in the market Increases comfort on the wrist in standing poses as wrist can rest more comfortably on the curved edge of the block than a standard flat side Increases comfort in heart openers and back bends when lying on the ground so the back can rest more comfortably on the block The iconic contoured design evolves the function of a yoga block while still allowing for the block to be completely stable and user friendly