60% linen 40% organic cotton machine washable can be adjusted from newborn to toddler. I absolutely love this carrier but honestly didn’t use it as much as I thought for baby number 2. I bought it for our second baby thinking I’d want to be hands free and really only used it a handful of times. The linen is perfect for summer it’s super supportive and light weight. I had no issues and has easily been the best carrier we’ve owned.