Thirsties One-Size Pocket Diaper is ultra-absorbent, a cinch to use, and designed to provide a great fit for most babies from 8 to 40 lbs. – regardless of whether your baby is tall, short, slim, or chunky. The diaper includes a newborn insert made of three layers of serged microfiber and a full-sized insert make of five layers of serged hemp jersey; eight layers in all! Microfiber is a fast absorber designed to rest closest to your baby’s skin (beneath the microfleece sleeve); hemp is a stable absorber and pairs perfectly behind the microfiber to add more absorbency and prevent compression leaks. Plus, there is no need to remove soiled inserts before washing – just toss the diaper in the washing machine and the insert(s) will agitate free during the wash cycle!