All in Twos or 'AI2s' combine all the best features from other cloth nappy styles to give you a simple to use, quick drying and cost effective nappy system. All in Two nappies consist of two parts, a waterproof outer and an absorbent inner which is usually topped with a stay-dry fabric. Like a Pocket Nappy All in Twos are quick to dry and easily customised with your desired amount of absorbency, like an All in One Nappy they are simple to use and very trim and like a Fitted Nappy or a Prefold they allow you change wet inners and re-use the cover saving you money by reducing the number of outers needed.