Heavy duty blue mackintosh PVC fitted sheet style leaving bottom of mattress exposed. Fits mattresses 13-18cm deep. IMPORTANT NOTE: There are NO RETURNS OR EXCHANGES on our PVC Mattress covers, so please measure your mattress carefully and ensure you order the correct size for your needs. When measuring, note that there is no givein the material. In other words, the cover won't stretch if it proves smaller than the mattress. Trying to force a mattress protector that's too small onto your mattress will likely cause it to tear. If your measurements don't align with ours, it's better to opt for a larger size. Note that customers with mattresses that do not match the specifications of our covers often elect to purchase a larger cover (e.g. a double instead of a single) and tuck the excess under the mattress.