This accessory is compatible with the pikkolo soft structured baby carrier, as well as any mei tai or mei tai-style buckle carrier. Thread the waist straps of your carrier through the channels in order to add a firmly padded waist support to your pikkolo or mei tai. Must remove and reverse buckle direction, in order to wear your carrier non-apron as intended for this application. We recommend this as something you may wish to graduate to as your child enters the 20-25 lb. range, not something you will want to add and remove frequently. 100% black cotton fabric, made in US, patent-pending. Spot clean.