Would you recommend using a mattress protector or a bed sheet?

Yes, even though the OTTY Original Hybrid mattress cover is removable and washable, we do recommend that you use a mattress protector or a fitted bed sheet to sleep on. It just makes the washing process easier! 

Any standard bed sheet or mattress protector will be suitable.

OTTY Pure - We advise use of a mattress protector as the cover is dry clean only