No Weather Restriction: Costzon sandbox is made of HDPE material, which is less susceptible to decay or wear than wood, which is suitable for outdoor use such as parks, beaches, and backyards. The smooth surface and the curved edges make it less likely to hurt child’s the delicate skin. 8pcs ground stakes are included for extra stability..Detachable 4 Built-in Seats: Accommodates for maximum 4 kids to share the happiness of sand playing together. 4 seats (weight capacity:165lbs/seat) are evenly distributed on the sandbox for kids’ rest when they are tired. If there is any extra large space demand, you can also detach the seats flexibly..Fully Adjustable Sand Depth: Your kids are not limited to sand only as deep as the sandbox. The bottomless construction facilitates drainage, ventilation and adjustment of the depth of the sand, which allows kids to freely adjust the depth of the sand to suit their imagination..Keep Neat & Tidy - You can keep sand neat and tidy after the play time is over. The enclosed waterproof cover can protect the sand from rains, large animals and debris. A Piece of oxford bottom liner is also included for the easy storage of sand so that your kids can enjoy sand time anywhere..Have Fun with Sand: Our sandbox provides enough space for your kids to play, dig, build and explore. The children's imagination and creativity can be developed through exciting games. It will give kids a perfect place to build sandcastles, dig for treasure and play with all of their favorite sand toys. And you can easily assemble it in a short time according to the instructions.