It features adjustable snaps at both the waist and legs for a secure, tamper-proof fit. Gaps between the snap closures increases air flow, which help regulate the temperature inside the diaper!
Newborn - 6 to 12 lbs - used with the Newborn Sandy's Diaper
Small - 8 to 12 lbs - used with the Small Sandy's and One Size Fitted Diapers
Medium -10 to 20 lbs - used with the Small Sandy's and One Size Fitted Diapers
MedLarge - 20 to 27 lbs - used with the Large Sandy's and One Size Fitted Diapers
Large - 27 to 35 lbs - used with the Large Sandy's and One Size Fitted Diapers
XLarge - 35 to 45 lbs - used with the Toddle-ease Diapers
Note: The Air Flow™ covers run true to size, no need to buy big. They are designed with a roomy fit, though they do compress down under clothes nicely. While the generous cut of the Air Flow™ covers make them a great choice for fitted diapers, if you would like to use them with prefolds or flats the diaper must be secured first with a Snappi or pins.