The bamboo viscose of this Perlimpinpin newborn hat will comfortably protect your baby's head from UV rays while retaining their natural body heat. Available in two sizes. Bamboo properties:- Exceptional breathability- Wicks away excess moisture while maintaining the comfort of a moderate body heat- Natural and renewable fiber- 100% biodegradable, it grows without the use of pesticides or chemicals- Naturally antibacterial- Hypoallergenic and regulates body temperature- This makes it the preferred textile for babies' delicate skin Wash before use. Wash in cold water with similar colors. Remove promptly. Do not bleach. Dry flat. Composition: 70% Bamboo Viscose / 30% Cotton