This is a big bubble upon pool to cut off cold air in the winter days. It also can used for pool protect from dry leaves fall down into pool in the autumn. In all, it is wildely used for mobile pool dome tent. The frame of tent can make without rigid iron tube,that makes it's easy for setting up or packing up. What's more, the material is high durable, flame&UV resistant,innocuouse and waterproof. It's totally environmental friendly.