The breathable mesh material keeps your baby comfortable while you carry them. - Brand: BABYBJÖRN - Product Name: BABY CARRIER MINI - Material: Mesh - Age Range: 0-1 year old - Weight Range: 3.2-11kg I used this from when my baby was a newborn until they were about 5 months old. There is some slight pilling on the inside under the arm (see the last photo, #11) due to rubbing, but it's on the inside so it's not very noticeable. Overall, there are no noticeable stains or yellowing, but please refrain from purchasing if you are sensitive to used items. I have discarded the instructions, so this is the item only.