These climb and crawl waves are individual pieces filled with an extremely firm foam and covered in synthetic leather. The mountains and valleys can be put together in different combinations to build a balancing path or an obstacle course. Also can be used as a single element or separate seating option. Hills promote balance, spatial cognition and a positive effect on motor skills development, because children have to move in many different ways to maneuver. Perfect for the high demands of early learning centers, children's libraries or schools. Weight: 17¾lbs. Filled with RG 25/60 foam, so children's feet won't sink in or trip over the edges. Removable cover made with hypo-allergenic synthetic leather which can be taken off and washed, Oko Tex 100 Product Class 1. Colors: Turquoise Blue and Sapphire Blue. The base is firmly glued onto the foam and bonded with the synthetic leather cover - this means the cover won't slip. Honeycomb grip bottom makes it stable.