The Ecoposh OBV (Organic Bamboo Velour) One Size Fitted Cloth Diaper is designed to incorporate four sizes in one diaper. The Ecoposh OBV One Size will accommodate little ones ranging from 6-35 pounds (birth to potty training). The Ecoposh OBV One Size is a fitted pocket diaper system that includes a set of absorbent Bamboo 6r Soaker fleece pads. The soaker set is customizable for six absorbency settings allowing adjustable absorbency. The 6r Soaker inserts slide into the inside of the Ecoposh OBV One Size through the pocket opening. The Ecoposh OBV One Size is made out of organic cotton, bamboo velour (viscose of bamboo rayon) and recycled water bottles. The Ecoposh OBV One Size is a fitted diaper, which is not waterproof. This diaper requires the use of a diaper cover, such as the Ecoposh Wool Diaper Cover (sold separately). This diaper is the perfect solution for nighttime use or heavy wetters! Ecoposh OBV One Size, complete with the Bamboo 6r Soaker, is an absorbent 10 layers thick