Yes you can. That makes the lying comfort even higher, because the bisonyl cover is very easy to clean, but does not feel very soft. Bisonyl does take over the heat from the environment, so it feels comfortable in that sense when the waterbed is warm. The dimensions are the same as normal mattresses (100, 140, 160 and 180 cm wide) so a fitted sheet fits perfectly around this. These are not available at Nenko.