Have got a lovely new kingsize bed which DP and I currently share with 4 month old DS2 and occasionally 2.11yr DS1 too; hence need for decent waterproof mattress protector 
We currently have one which has a towelling upper and very rubbery underside. It does the job but takes any absolute age to dry.
Is this just the nature of waterproof sheets?
I'd be very grateful for recommendations of good ones as think I need more in view of nearly daily bedchanging ATM.
TIA