The multitex core gives the balance between absorbancy and drying time. Tots Bots state that the Size 2 flexitot will absorb 640ml as opposed to a leading disposable which does 550ml,and it does it about 75% quicker. Ultra absorbent microfibre core holds twice as much liquid as cotton. Super slim less bulky that Tots Bots original nappies. Spft and comfortable and dries superfast. A very stretchy and comfortable nappy. Available in SIze 1 (8-18lbs) and Size 2 (18-35lbs)