Cotton 【Baby Walker Head&Back Protection】Effectively relieve impact and prevent baby from injured when baby learn to walk and crawl 【Soft&High-elastic Material】Premium crystal velvet fabric and high-elastic PP cotton filler, gentle on baby’s delicate skin 【Adjustable Plush Straps】Shoulder and chest belts conforms to baby's different size, effectively preventing slipping during use 【Adorable&Durable Knee Pads&Anti-slip Socks】Protect baby's knees from bruises and scrapes and prevent slip for baby toddler crawling 【Baby Must-Have Gift List】Ideal for Baby Shower, Christmas, Birthday, Easter, Halloween, Thanksgiving, Valentine's Day and New Year Baby Head Protector Backpack with Knee Pads&Anti-Slip Socks