When you inflate the outer ring, the height can reach 2.5 ", but the corresponding product size will also decrease, ultimately becoming 23" x18". The size is 26 "x20" when you received the goods without inflating the outer ring

Our water mats are made of heavy PVC material which is strong, durable, non-toxic and BPA free . Each water mat has passed a strict quality inspection

Fill outer ring with 2/3 air to use, over filling cause it to explode. The inflation port has a paddle that needs to be returned to its correct position after use to prevent leakage. After filling inner ring with water, confirm that water outlet is tight and away from sharp objects to avoid leakage